Why roofs leak. And how we prevent it.

Why it causes leaks.

The adhesive strip is the band on the underside of each shingle that bonds it to the shingle below. The strip also covers the nail heads, sealing them against water. If the strip never bonds — bad adhesive batch, cool weather at install, or contamination on the shingle face — water reaches the nail heads and leaks through.

How HomeVenture prevents this.

Both CertainTeed Landmark and the Malarkey product lines we install include adhesive strips designed to bond reliably during install. The first-year HealthyRoof inspection that comes with your roof verifies the strips have set properly, so any bad adhesive batches get caught early before they have a chance to leak.

Where this gets missed.

Most do not return to verify sealing. Adhesive strips need time and heat to bond, and an unsealed strip can sit unnoticed for a year or two before the first leak shows up.

Why it causes leaks.

Trapped hot, humid air in an under-ventilated attic dries shingles out from underneath. The asphalt loses flexibility, the shingle stiffens, and it cracks — first hairline, then enough to let water through.

How HomeVenture prevents this.

Polymer-modified shingles (the Malarkey rubberized asphalt lines and CertainTeed Landmark) stay flexible longer than basic three-tab shingles, which dry out and crack within a decade. Beyond shingle composition, we also design balanced intake-and-exhaust ventilation calculated to your specific roof, so attic temperatures stay stable and the shingles aren't being cooked from the back side.

Where this gets missed.

Many default to ridge vents only. Without intake at the soffit to feed the ridge vent, the system runs unbalanced and the attic overheats.

Why it causes leaks.

Hail bruises shingles, knocks granules loose, and weakens the mat layer underneath the asphalt. The damage is sometimes invisible from the ground but creates entry points that fail months or years later.

How HomeVenture prevents this.

For maximum hail resistance, the Malarkey Vista Class 4 impact-rated shingle is the strongest defense in the residential lineup. The rubberized asphalt absorbs impact and grips granules even after a hit. For homeowners not in a hail-prone area, the CertainTeed Landmark or Malarkey Highlander lines provide solid baseline protection at a lower cost. Your first-year HealthyRoof inspection documents the roof's condition with photos so that any future storm damage has a baseline to compare against, which strengthens any insurance claim you may need to file.

Where this gets missed.

Most do not document roof condition year over year. Without a documented baseline, hail claims become arguments about whether the damage is new or pre-existing.

Why it causes leaks.

High winds lift shingles where adhesive bonds have weakened or where nails were not driven correctly. Once a shingle lifts, water gets underneath, and the next storm makes it worse.

How HomeVenture prevents this.

Two factors protect against wind damage. First, polymer-modified shingles flex and lay back down when lifted, resisting breakage — both CertainTeed Landmark and the Malarkey rubberized asphalt lines perform this way. Second, when CertainTeed Landmark is installed as a complete Integrity Roof System by our ShingleMaster credentialed crew, the project qualifies for an unlimited wind velocity warranty (most warranties cap at 110 to 160 mph). We use six-nail storm nailing on every install to qualify for the manufacturer's enhanced wind warranty. The first-year HealthyRoof inspection confirms shingles are still sealed and identifies any that need re-securing.

Where this gets missed.

Crews can miss the nailing zone or overdrive nails, both of which weaken wind resistance. Many install the four-nail minimum, which leaves enhanced-wind-warranty money on the table for the homeowner.

Why it causes leaks.

Granules are what protect the asphalt mat from UV damage. As shingles dry out, granules release more easily and the asphalt beneath gets exposed. Once UV starts cooking the asphalt directly, the shingle starts to fail — and a failed shingle leaks.

How HomeVenture prevents this.

Three layers: polymer-modified shingles (CertainTeed Landmark and Malarkey rubberized asphalt) grip granules longer than basic oxidized asphalt by design. Balanced ventilation slows the drying process that accelerates granule release. The first-year HealthyRoof inspection looks specifically for early granule loss so we can flag a shingle batch problem under warranty before the roof is past its claim window.

Where this gets missed.

Install oxidized asphalt shingles that dry out faster. Do not return to check for granule loss, which means a defective batch goes undetected until the warranty has expired.

Why it causes leaks.

Production runs sometimes ship defective shingles. The defects show up as curling, blistering, premature granule loss, or unsealed adhesive strips. Once shingles fail this way, the only fix is replacement under warranty.

How HomeVenture prevents this.

We install shingles from manufacturers with established track records. More importantly, the first-year HealthyRoof inspection catches defect symptoms early so warranty claims can be filed before the warranty period runs out. If the manufacturer refuses to honor the claim, our documented install record is the evidence we use to push the claim through on your behalf.

Where this gets missed.

Do not follow up. Defects go unnoticed for years, by which time the warranty has either expired or the manufacturer has more leverage to deny the claim.

Why it causes leaks.

Nails can back out of the decking from wood movement (expansion and contraction across seasons) or from being installed too short to grip. When a nail backs out, it pierces the shingle above and creates a direct path for water into the attic.

How HomeVenture prevents this.

We use proper nail length to fully penetrate the decking, not the cheaper 1¼-inch nails that get used on 1x decking and lose grip quickly. Every nail is set flush, not proud and not buried. The first-year HealthyRoof inspection finds any nails that have lifted and re-secures them before they become leaks.

Where this gets missed.

Crews sometimes use undersized nails that lose grip over time, particularly on 1x decking. Without a follow-up inspection, nail pops appear over the next several seasons as a sequence of small leaks rather than one obvious problem.

Why it causes leaks.

A nail driven too deep cuts into the shingle instead of sitting flush against it. The cut shingle holds less tightly, and the nail head no longer seals against water.

How HomeVenture prevents this.

Air pressure on the nail guns is calibrated before each section. Crew members visually verify nail depth as they work. Quality checks during install catch overdriven nails before the next course goes down.

Where this gets missed.

Crews routinely overdrive when air pressure is set too high. Most do not return to verify or fix the problem. Overdriven nails void the manufacturer warranty on most shingle lines.

Why it causes leaks.

Manufacturers publish a specific nailing zone on each shingle. Nails outside that zone may miss the decking, lose grip, or fail to provide the wind resistance the warranty requires. Off-zone nailing also voids the manufacturer warranty.

How HomeVenture prevents this.

Our crews are trained to follow the manufacturer's nailing zone exactly. Quality checks during install confirm placement on every section before the course above it goes down.

Where this gets missed.

Crews miss the zone in a hurry. Without quality checks during the install, off-zone nails go unnoticed until a wind event or a warranty claim exposes them.

Why it causes leaks.

Step flashing seals the joint where the roof meets a vertical wall (like a dormer or chimney). Missing, reused, or undersized step flashing lets water track behind the shingles and into the wall.

How HomeVenture prevents this.

We use 4x4x8 step flashing on every install, not the undersized 2.5x2.5x8 that gets stocked at supply houses because it's cheaper. The first-year HealthyRoof inspection checks every flashed joint for movement or corrosion.

Where this gets missed.

Use the undersized 2.5x2.5x8 flashing because it costs less. Reuse old flashing when re-roofing. Skip the step flashing entirely on shorter wall transitions.

Why it causes leaks.

A valley is the V-shaped channel where two roof planes meet. Valleys carry the largest volume of water on the roof during a rain event, so any failure point in a valley is amplified. Debris that builds up in a valley dams water back under the shingles.

How HomeVenture prevents this.

Most roofers install ice-and-water shield only at the eaves because that is where code requires it. HomeVenture installs ice-and-water shield in every valley on every roof, regardless of code minimums, because valleys carry the highest water volume on the roof. The first-year HealthyRoof inspection clears any debris and verifies the shield is still sealed.

Where this gets missed.

Skip ice-and-water shield in valleys when code doesn't require it. Never return to clear debris.

Why it causes leaks.

Sidewall and headwall flashing seal the roof-to-wall transitions. Without proper flashing and lapping at these transitions, water backs up against the wall and finds its way behind the siding.

How HomeVenture prevents this.

We lap ice-and-water shield up the wall and install new heavy-duty flashing at every roof-to-wall transition. The first-year HealthyRoof inspection re-checks these transitions because they are where most second-year leaks show up.

Where this gets missed.

Reuse old flashing instead of installing new. Skip proper lapping. Once the siding is replaced over the top, the problem stays hidden until it leaks.

Why it causes leaks.

Pipe boots seal the gap where plumbing vents penetrate the roof. Standard PVC and rubber boots dry out, crack, and fail well before the roof itself wears out — typically in 5 to 10 years.

How HomeVenture prevents this.

A leaking pipe boot on an existing roof is typically a repair call, not a full replacement: we remove the failed boot and install an aluminum or siliconized boot rated for 50+ years. On full replacements, these premium boots are installed as standard so the failure mode doesn't repeat. The first-year HealthyRoof inspection catches early cracking before it becomes a leak.

Where this gets missed.

Use the basic rubber boots stocked at supply houses (5 to 10 year lifespan). Never return to check.

Why it causes leaks.

Skylight seals fail over time. Old flashing kits reused from previous installs do not seat correctly on the new shingle. Both pathways let water in.

How HomeVenture prevents this.

We recommend replacing skylights during a re-roof, or at minimum installing new flashing kits. We only use proven leak-free skylight manufacturers with laminated glass. Manufacturer warranties on skylights almost always require a precise install to remain valid, which we follow exactly.

Where this gets missed.

Old flashing kits get reused during re-roofs even though they were never designed to seat against the new shingle. Skylight manufacturer warranties typically require a precise install that's easy to miss when the rest of the project is moving fast.

Why it causes leaks.

Attic exhaust fans that fail early leave the attic overheated, which dries shingles out from the back side and accelerates aging across the entire roof. A failed fan does not leak directly — it shortens the life of every shingle above it.

How HomeVenture prevents this.

Existing AC "exhaust" vent fans are inspected before tear-off and replaced if they are already failing. New ventilation is designed as a balanced intake-and-exhaust system, not a single component bolted on. The first-year HealthyRoof inspection verifies the system is still moving air the way it was calculated to.

Where this gets missed.

Reuse existing fans without inspection, even when they are failing. Install ridge vents alone without intake, which leaves the system unbalanced.

Why it causes leaks.

Anything drilled into the roof — satellite dishes, antenna mounts, solar penetrations — creates a hole that depends entirely on the seal around it. Screws back out over time and caulking wears down, leaving the penetration open to water.

How HomeVenture prevents this.

We discourage roof mounts in the first place. If a mount is unavoidable, we flash and seal the penetration properly and inspect it during the first-year HealthyRoof check. Penetrations made by other trades (like solar installers) are not covered under our leak-free workmanship terms — so any installer working on a HomeVenture roof needs to follow our flashing protocol or that coverage is voided for those penetrations.

Where this gets missed.

Roof mounts are often sealed with caulking alone, without proper flashing underneath. Caulking has a finite lifespan; once it cracks, the penetration is open to water.

Why it causes leaks.

Unbalanced attic ventilation overheats the attic, causes condensation on the underside of the decking, and dries shingles out from below. The result is cracks, granule loss, and accelerated aging across the entire roof. Condensation that forms on the deck eventually rots the wood, which becomes a structural problem.

How HomeVenture prevents this.

We design balanced intake-and-exhaust ventilation calculated to your specific roof and home. Proper airflow keeps shingles cooler, slows aging, and prevents condensation. The first-year HealthyRoof inspection confirms vents are clear and the system is still working as designed.

Where this gets missed.

Default to ridge vents only and skip intake at the soffit. The system runs unbalanced. The attic overheats. The shingles age twice as fast as they should.

Why it causes leaks.

Builder-grade underlayment tears easily during install and fails under stress. Code-minimum underlayment may be code-legal but provides minimal secondary water defense.

How HomeVenture prevents this.

We use heavy-duty synthetic underlayment across the entire roof deck, lapped correctly so water tracks over each seam instead of under it. On low slopes between 2/12 and 4/12, we install double layers or ice-and-water shield where required.

Where this gets missed.

Dismiss underlayment as "just covered by shingles." Skip the double-layer requirement on low slopes. Use builder-grade underlayment that tears during install and gets covered up before anyone notices.

Why it causes leaks.

Shingles need pitch to shed water. Installed below 2/12 (or 3/12 depending on the shingle), they cannot shed water fast enough and water backs up under the shingle. This is a guaranteed leak, not an eventual one.

How HomeVenture prevents this.

On low-slope sections, we use proper membrane systems designed for low pitch instead of relying on shingles. The first-year HealthyRoof inspection keeps these sections clear of debris that can dam water back.

Where this gets missed.

Shingles sometimes get installed on slopes below the manufacturer's minimum because switching to a low-slope membrane adds time and material cost. Water eventually finds a path through, even if it takes several seasons for the leak to show up.

Why it causes leaks.

Gapped or rotted decking weakens nail hold and creates water pathways. Boards wider than 6 inches expand and contract too much across seasons, which loosens nails and lifts shingles.

How HomeVenture prevents this.

We replace compromised decking with matching material — OSB, plywood, or 1x6 — depending on what your home was originally built with. The first-year HealthyRoof inspection includes an attic check for early signs of decking failure that aren't visible from above.

Where this gets missed.

A new roof installed over gapped 1x10 boards voids most manufacturer warranties and produces intermittent leaks for the life of the roof. Rotted decking can be shingled over without addressing the underlying material, which leaves the structural problem in place under a new surface.