New Roof and Gutters: What to Get Right the First Time
Key Takeaways
- A new roof and new gutters are one water-management system, not two separate purchases. Sequencing and edge details decide whether that system works for the next 20+ years.
- Roof work should finish before gutters go up. Installing gutters first risks damage during roofing and gets the drip edge, shingle overhang, and gutter pitch wrong.
- Five Guardians. One Guard. is the engineering standard behind AEGIS 5X™, MasterShield’s gutter guard system. If you’re replacing your gutters anyway, this is the easiest point to add one: it fits to the new roofline instead of retrofitting to an old one later.
- Roof valleys and roof type both change what your gutter and guard need to handle. Neither is a detail to leave to whoever’s fastest to quote the job.
Your Questions Answered
Should I replace my gutters when I get a new roof?
If your current gutters are undersized, poorly pitched, or already damaged, replacing them alongside the roof avoids a second disruption and gives a MasterShield AEGIS 5X™ guard a fresh, correctly-pitched surface to install on rather than working around an older gutter’s condition.
When’s the best time to add a gutter guard?
During a new roof and gutter installation, when AEGIS 5X™ fits to the newly installed gutter and finished roofline as one step, instead of being retrofitted later to a gutter that’s already sagged or shifted pitch.
Do roof valleys need special gutter treatment?
Yes. A valley concentrates runoff from two roof planes into one section of gutter, and that’s exactly where PitchPerfect™’s roofline-following fit is tested hardest, since a flat guard surface is least able to shed a sudden, concentrated volume without overflowing.
You don’t have to guess at any of this alone. A local MasterShield dealer can walk your new roof and gutter plans and tell you plainly whether a guard makes sense to add now, and where the roof-edge details need attention first.
Over 10,000,000 feet installed | 0.009% warranty claim rate | passed ASTM B117-16 thousand hour corrosion test
5 shingle manufacturer approvals | 3 year independent real world field test | 17+ utility patents, all insured by IPISC
Get the sequence right: roof before gutters
Roof work should finish before new gutters go up. Roofers routinely remove existing gutters to install the roof correctly, then reinstall or replace them once the roof deck, drip edge, and shingles are done. Gutters installed first are exposed to falling debris, foot traffic, and tear-off material during roofing, and often end up re-cut or damaged before they’ve ever caught a drop of water.
Sequencing also decides whether the roof edge gets built correctly at all. Drip edge and shingle overhang both key off the finished roof deck, so if the gutter goes on first, installers are guessing at a roofline that isn’t final yet. Getting this order right costs nothing extra: it’s a scheduling decision, not a purchase.
If your existing gutters are in solid shape, they can often be removed, set aside, and reinstalled once the roof is finished rather than replaced outright. That’s a case-by-case call for whoever’s doing the roof work, based on the gutter’s condition, not a default either way.
That gap between the two roof edges above is the whole argument for getting the sequence right in the first place.
How This Benefits You
The install details that decide whether it lasts
Four details determine whether a new roof-and-gutter job holds up, and they’re the ones most often shortcut.
Drip edge and flashing. Shingles and any ice barrier or felt should extend over a metal drip edge at the roof’s edge, required by the International Residential Code at eaves and rakes1 and still skipped by some installers. Without it, water follows the shingle edge down the fascia board or splashes up from inside the gutter, and the fascia takes the damage: peeling paint first, then rot that eventually has nothing left to hold the gutter in place. Insisting on drip edge with a new roof and gutters is a small add that prevents a much larger repair later.
Shingle overhang. Manufacturers generally call for a 3/4- to 1-inch overhang past the eave. Some installers stretch this to compensate for a wavy roofline, but going much past an inch causes its own problems: shingles that extend too far can drop into the gutter trough itself, where they wick up standing water like a straw.
Gutter height and pitch. The gutter’s high point should sit where a straight edge laid on the shingles would just clear the front lip, not shoved up underneath the shingles, which is the easier install but the wrong one. A gutter mounted too high gets pulled away from the house as snow slides off the roof in cold climates; mounted correctly, it clears the shingle edge without catching runoff at the wrong angle.
Sizing and downspouts. A gutter has to be sized for the roof area feeding it, and modern rooflines with multiple valleys and planes often need more capacity than a builder-grade gutter provides. Undersized connectors are a common shortcut. A wider downspout connector, or a second downspout on a large roof section, moves water off the roof considerably faster than squeezing everything through one narrow outlet.
From the Field
“The mistake I see most with a new roof and gutters is the installer treating them as two separate five-minute jobs instead of one water-management system. The drip edge, the overhang, the gutter height, they all depend on each other. Get one wrong and the other two don’t matter, the water finds the gap anyway”
Aaron Kapfer, Field Authority
That’s the standard to hold any installer to before signing off on the details above.
Ask This.
Before you sign off on a new roof and gutter installation, ask any installer:
- How does debris keep moving instead of settling?
- How does heavy rain get into the gutter without overshooting it?
- How does the surface stay open over time?
- How does it resist moss, algae, lichen, and bio-growth?
- How does installation protect vulnerable roof-edge shingles?
- Is the gutter being pitched and hung after the roof deck is finished, or before?
When roof and gutter metals don't get along
New roofs and gutters sometimes bring dissimilar metals into direct contact: a steel roof edge against an aluminum gutter, or a copper gutter against a galvanized fastener. That contact point matters. When two different metals touch in the presence of moisture, the more reactive metal corrodes faster right at the contact point, a basic electrochemical reaction rather than a defect in either material.2 It’s why installers sometimes use a separating layer, a compatible fastener, or a coated connector where two different metals meet.
This is a detail worth asking about, not assuming your installer has handled. It’s most relevant with metal roofing paired with a gutter or gutter guard in a different metal, and least relevant with a straightforward asphalt-shingle roof and matching-metal gutter system. If you’re not sure what’s in contact with what on your own roof edge, that’s a fair question to put directly to whoever’s doing the installation.
The best time to add a gutter guard is during this project, not after
Most guidance on a new roof and gutters covers sequencing, cost, and material choice, and stops there. That’s a missed step, because a new roof and gutter installation is the easiest point in a home’s life to add a guard.
Fitted during installation, a guard gets matched to the new gutter and the finished roofline from the start, installed once, to the roof edge as it now exists, instead of retrofitted later to an older gutter that may already be sagging, mis-pitched, or undersized. AEGIS 5X™ guards, MasterShield’s engineering standard for gutter protection, install to the gutter’s front lip without altering the roof or voiding a roof warranty, and PitchPerfect™, the standard’s roofline-fit guardian, follows the pitch installers just set rather than fighting an existing, possibly imperfect, gutter angle.
Some homeowners hear this and assume any gutter guard works fine as a later add-on, so timing doesn’t really matter. That’s true for a flat, one-size guard, but it skips the fitting problem: a guard added years later has to work around whatever pitch and condition the existing gutter is already in, while a guard fitted during the original install gets built to match a gutter that hasn’t moved yet.
Skipping this step doesn’t cost you the option forever, a guard can always be added to an existing gutter later. It does mean a second, separate visit and installation, fitted around whatever gutter condition exists at that point rather than a fresh one.
If a guard is even a maybe for this project, this is the cheapest point in your home’s life to find out. A local MasterShield dealer can look at your roof and gutter plans before installation and tell you whether adding a guard now makes sense for your roofline.
Over 10,000,000 feet installed | 0.009% warranty claim rate | passed ASTM B117-16 thousand hour corrosion test
5 shingle manufacturer approvals | 3 year independent real world field test | 17+ utility patents, all insured by IPISC
Roof valleys: the problem area a straight gutter run can't handle
A roof valley is where two roof planes meet at an angle and funnel their combined runoff into a single line, and wherever that line ends over a gutter, that section is handling roughly double the water of a straight run nearby. A gutter and guard sized and pitched for an average section of roof can be undersized exactly where a valley empties into it.
The result shows up two ways. In heavy rain, a valley outlet can overflow a gutter that’s handling every other section of roof just fine; the problem is local to that one spot, not the whole gutter run. In winter, that same concentration point is one of the more common places for ice to build first, since valleys collect snow from two roof planes at once, so more meltwater reaches that section of eave than anywhere else on the roof.
A valley rain diverter, a small flashing piece that redirects the valley’s water flow after it hits the gutter directly, is one way installers address this concentration point. Where a gutter guard is involved, PitchPerfect’s roofline-following fit matters most exactly at these transition points, since a flat guard is least able to shed a sudden, concentrated volume of water without overflowing.
Compare this
| Guard type | What it solves | What it exposes at a valley | What to ask before buying |
|---|---|---|---|
| Screen | Blocks large debris | Fine grit and shingle grit clog the perforations at high-flow points | Does it clog at the volume this specific valley sees? |
| Foam | Simple, low-cost fit | Compresses and traps debris; a valley's extra flow pushes water over a saturated foam insert | How does it perform after a season of valley runoff, not just on install day? |
| Reverse-curve | Sheds large debris via surface tension | Can shed water itself at high volume before it reaches the trough | Has it been tested at this valley's specific flow rate? |
| PitchPerfect™ (flat micromesh, roofline-fit) | Follows the roof's own pitch, keeping water moving instead of pooling | Engineered for concentrated flow at transition points like a valley | Ask specifically how it's rated for valley-outlet volume, not just average-run performance |
What your roof type means for your gutter and guard fit
The identification question, hip, gable, mansard, flat, matters less for your gutters than what that roof shape does to water volume and valley count. A simple gable roof sheds water off two planes with no valleys at all. A hip roof, or any roofline with multiple gables and dormers, creates valleys wherever two planes meet, and each valley is a concentration point like the one above.
Roof material changes the picture too. Metal roofing, including standing-seam, sheds water and snow faster and in a more concentrated slide than asphalt shingles, which means the gutter beneath a metal roof edge deals with a faster, heavier flow during a thaw or a storm than the same-size gutter under asphalt. This is also where the dissimilar-metal question from earlier applies most directly: a metal roof edge meeting a gutter or guard in a different metal is worth a direct question to your installer, not an assumption.
None of this changes what gutters or guards fundamentally do. It changes how much volume and how much concentration a given section has to handle, which is exactly what a roof-edge evaluation is for.
Considering a new roof and gutters isn’t a decision to make on cost alone. For a sense of what a guard adds to the project, the gutter guard cost guide breaks down current pricing factors by material and roof type.
You’ve got the sequence and the details down. If a guard is part of this project, what’s left is getting your specific roofline looked at before install day.
Over 10,000,000 feet installed | 0.009% warranty claim rate | passed ASTM B117-16 thousand hour corrosion test
5 shingle manufacturer approvals | 3 year independent real world field test | 17+ utility patents, all insured by IPISC
Frequently Asked Questions
Sequencing and installation
1. Should I replace my gutters when I get a new roof?
Replacing gutters alongside a new roof makes sense when the existing gutters are undersized, poorly pitched, sagging, or already showing damage. If the existing gutters are in solid condition, they can often be removed, set aside, and reinstalled once the roof is finished rather than replaced. Either way, roof work should be completed first: installing new gutters before the roof is done exposes them to damage from tear-off debris and foot traffic, and the drip edge and shingle overhang can’t be set correctly against a roofline that isn’t finished yet. If a gutter guard is part of the plan, new gutters give MasterShield’s AEGIS 5X™ system a fresh, correctly pitched surface to install on rather than working around an older gutter’s condition.
2. What comes first, the roof or the gutters?
The roof comes first. Roofers typically remove existing gutters during roof replacement to access the eaves and roof deck correctly, then reinstall or replace them once the roof, drip edge, and shingles are complete. Installing gutters before the roof risks damage to the new gutters during roofing work and makes it difficult to set the correct shingle overhang and gutter pitch against a roofline that hasn’t been finished. That same sequence matters for a gutter guard: PitchPerfect™, part of MasterShield’s AEGIS 5X™ standard, is fitted to match the roof’s finished pitch, so it needs the roofline settled first, same as the gutter itself.
3. Can my existing gutters be reused with a new roof?
Gutters in solid condition, no sagging, no rust-through, no persistent leaks, can often be removed, set aside during roofing, and reinstalled once the roof is finished. This is a case-by-case decision based on the gutter’s actual condition, made by whoever is doing the roof work, not a default either way. Gutters that are already undersized, damaged, or poorly pitched are better replaced while the roof edge is already being worked on, especially if a MasterShield AEGIS 5X™ gutter guard is going on afterward, since the guard’s fit depends on the gutter’s pitch and condition underneath it.
4. What is a drip edge, and do I need one?
A drip edge is a metal flashing piece installed at the roof’s edge, under the shingles and ice barrier, that directs water cleanly away from the fascia and into the gutter. Without it, water follows the shingle edge down the fascia board or splashes up from inside the gutter, leading to paint peeling and eventual fascia rot. Drip edge is required by the International Residential Code at eaves and rakes and is a low-cost way to prevent a much larger repair later.
5. How far should shingles overhang the gutter?
Most shingle manufacturers call for a 3/4″ to 1″ overhang past the roof eave. Some installers extend this slightly to compensate for a wavy roofline, but overhang beyond about an inch causes its own problems: shingles extending too far can drop into the gutter trough itself, where they wick up standing water and stay wet longer than intended.
Materials and compatibility
6. Can different metals be used together on a roof and gutter system?
Different metals can be used together, but direct contact between two dissimilar metals in the presence of moisture causes the more reactive metal to corrode faster at the contact point, a basic electrochemical reaction, not a product defect. This matters most where metal roofing meets a gutter or gutter guard in a different metal, and least with a standard asphalt-shingle roof and matching-metal gutter system. The same question applies to a gutter guard’s own materials: MasterShield’s AEGIS 5X™ system uses stainless steel and copper in its construction, so it’s worth asking your installer the same dissimilar-metal question about the guard as you would about the roof and gutter.
7. Does a metal roof affect what gutter I need?
Metal roofing, including standing-seam, sheds water and snow faster and in a more concentrated flow than asphalt shingles, so the gutter beneath a metal roof edge handles a faster, heavier volume during a thaw or storm than the same-size gutter under asphalt. Gutter sizing and pitch for a metal roof edge should account for that faster shed rate, not assume the same capacity that works under shingles. If a gutter guard is part of the plan, PitchPerfect™’s roofline-following fit is built to handle that faster, more concentrated shed rather than the steadier flow off asphalt.
Gutter guards and timing
8. When's the best time to add a gutter guard?
The best time to add a gutter guard is during a new roof and gutter installation, when the guard is fitted to the newly installed gutter and finished roofline as one step. Adding a guard at this stage avoids the mismatch that develops when a guard is fitted years later to a gutter that has since sagged, shifted pitch, or been resized. AEGIS 5X™, MasterShield’s engineering standard, installs to the gutter’s front lip without altering the roof or affecting a roof warranty.
9. Can I add a gutter guard to an existing gutter later?
Yes. Adding a guard is not limited to the time of gutter installation; a guard can be fitted to an existing gutter at any point. Adding it later means a separate installation visit fitted around whatever condition the existing gutter is in at that time, rather than the fresh gutter and roofline a same-project installation would provide. PitchPerfect™ still fits to whatever roofline and gutter pitch exist at the time of installation, whether that’s during a new roof project or years afterward.
9. Can I add a gutter guard to an existing gutter later?
Yes. Adding a guard is not limited to the time of gutter installation; a guard can be fitted to an existing gutter at any point. Adding it later means a separate installation visit fitted around whatever condition the existing gutter is in at that time, rather than the fresh gutter and roofline a same-project installation would provide. PitchPerfect™ still fits to whatever roofline and gutter pitch exist at the time of installation, whether that’s during a new roof project or years afterward.
10. Does adding a gutter guard affect my roof warranty?
A gutter guard that attaches to the gutter’s front lip, rather than to the shingles or roof deck, does not affect a roof warranty. MasterShield’s AEGIS 5X™ system attaches this way, without fastening to the shingles or roof deck. Confirm the attachment method with whoever is installing the guard, since the distinction is in how and where the guard is fastened, not whether a guard is present at all.
11. What's the advantage of adding a gutter guard with a new roof over doing it separately?
Adding a guard during a new roof and gutter project means it’s fitted once to the gutter and roofline as they now exist, in the same visit as the rest of the work. Doing it separately later means a second installation visit, fitted around the gutter’s condition at that later point rather than a fresh one. PitchPerfect™ fits the roofline correctly either way, so the main difference is convenience and timing, not structural performance.
Roof valleys
12. Do roof valleys need special gutter treatment?
Yes. A roof valley funnels runoff from two roof planes into a single section of gutter, so that section handles roughly double the water volume of a straight run nearby. A gutter and guard sized for an average roof section can be undersized specifically at a valley outlet, even when the rest of the gutter run performs fine. PitchPerfect™’s roofline-following fit is most tested exactly at these transition points, since a flat guard surface is least able to shed a sudden, concentrated volume without overflowing.
13. Why do gutters overflow under a roof valley?
Gutters overflow under a valley when the concentrated water volume from two roof planes exceeds what that section of gutter and downspout can carry, even if neighboring sections of the same gutter run are performing normally. The overflow is local to the valley outlet, not a sign the entire gutter system is undersized. A flat gutter guard makes this worse by giving the concentrated flow a shelf to back up on before it can drain; PitchPerfect™’s pitched surface keeps that same volume moving instead.
14. What is a valley rain diverter?
A valley rain diverter is a small flashing piece installed at the front lip of the gutter that redirects the concentrated water flow back into the gutter, spreading it out instead of dumping it at a single point. It’s one way installers address the volume concentration that a valley creates at the gutter line. Where a gutter guard is also present, PitchPerfect™’s roofline-following fit complements a diverter by keeping the spread-out flow moving through the guard instead of pooling on it.
Roof types
15. What type of roof do I have?
Common residential roof types include gable, a simple triangular roof and the most common style, hip, with four sloped sides meeting at a central ridge, and flat or low-slope roofs. What matters more for your gutters than the style name is how many valleys the roofline creates, since a simple gable has none, while a hip roof or a roofline with multiple dormers creates a valley wherever two planes meet.
16. Does my roof type affect what gutters or guards I need?
Common residential roof types include gable, a simple triangular roof and the most common style, hip, with four sloped sides meeting at a central ridge, and flat or low-slope roofs. What matters more for your gutters than the style name is how many valleys the roofline creates, since a simple gable has none, while a hip roof or a roofline with multiple dormers creates a valley wherever two planes meet.
Cost
17. How much does a new roof and gutters cost?
Cost depends on roof size, material, gutter length, and regional labor rates, and varies enough project to project that a general figure isn’t a reliable planning number. Roof and gutter replacement pricing itself is a conversation for your roofing contractor, since MasterShield does not perform roof or gutter replacement.
Essential Takeaways for Roof and Gutter Projects
- International Residential Code, §R905.2.8.5: drip edge required at eaves and rakes of shingle roof assemblies.
- Metal Construction Association, “Dissimilar Metal Corrosion in Roofing Installations,” Technical Bulletin. metalconstruction.org
About the Author
Karen Sager
All author postsAaron Kapfer
Contributor — Field AuthorityAaron Kapfer, Success Leader at MicroMeshGutterGuards.com, is a seasoned professional in the gutter protection industry, having worked in the field since 2000. Aaron has collaborated with major brands including LeafGuard, MasterShield Gutter Protection, KleanGutter Gutter Protection, and MicroMax Gutter Protection. Since joining the company in 2020, Aaron has been instrumental in helping companies expand their gutter protection businesses. His expertise encompasses Installation, Production, Sales, and Marketing training, focusing on in the field guidance and troubleshooting along with enhancing company efficiency.
