Layers and hidden decking

What’s under the shingles, and how surprises get handled

An estimate is written while the old roof is still on, which means the person writing it can see the surface, the attic from below where it’s accessible, and the edges, but not the full face of the decking. Soft spots underfoot, sagging between rafters, or water stains in the attic give clues. Still, the actual condition of each sheet of plywood or board isn’t known until the shingles and underlayment come off.

Older homes sometimes have more than one roof on them. A second layer of shingles was often installed directly over the first, and occasionally an asphalt roof sits over original wood shakes on spaced boards. Each extra layer adds weight to remove and haul away, and it hides the deck that much more completely. Asking how many layers are present, and how the estimator knows, is a reasonable first question. Lifting a shingle at an edge or looking at the rake from a ladder usually answers it.

Where the old roof sat over spaced board sheathing, asphalt shingles need a solid deck, so new plywood or OSB is installed before the new roof. That is a known condition that can be priced up front. Rot near a chimney, a valley, or an eave that leaked for years is different: it is found during tear-off and has to be dealt with that day so the roof can be closed up.

The fair way to handle that unknown is to agree on the rules before the work begins. Big Bear photographs damaged decking found during tear-off and reviews it with you before replacing it, at the per-sheet price stated in the estimate. Whoever you hire, you should know the unit price, how you will be told, and what happens if the damage extends beyond the deck into rafters or trusses — which is a separate repair, done with a structural engineer when it’s needed.

Questions about layers and decking

How many roofing layers are on the house now, and how was that confirmed?
Is there spaced board sheathing that will need a solid deck?
What is the per-sheet price for replacing damaged decking?
How will I see damaged areas — photos, a call, or in person?
Is any decking allowance already included, and how much?
What happens if rafters or trusses are damaged too?
Are attic stains or soft spots noted in the estimate?

Repair or replace

Repairing an aging Hazel Dell roof, or starting over

When a roof has layers or a history of leaks, patching gets harder to do well. Whether replacement is the better choice depends on how much of the deck and covering is affected.

Often still a repair

There is one layer, the shingles are still pliable, and the leak is limited to a single area
Attic staining is old and dry, matching a repair that has already held
A soft spot is small and localized around one penetration

Points toward replacement

There are two or more layers, so repairs can’t reach the deck properly
Soft decking or sagging shows in several places, from the roof or the attic
Leaks keep returning in different spots after repeated patches

Moss, stains, or a roof’s age alone don’t settle the question, and remaining life can’t be promised from a photo. An on-site roof inspection is the way to know. See also roof repair vs. replacement.

Scope

What a Hazel Dell roof replacement scope should include

For a roof with unknowns underneath, the most important parts of the scope are the ones that describe what happens during tear-off. The proposal should state that all existing layers will be removed down to the deck and hauled away, say how decking is evaluated and priced, and explain the approval step. It should then cover the rebuild: any new sheathing over spaced boards, underlayment, membranes where specified, flashing, drip edge, vents, pipe boots, ventilation, and the shingle line.

Permits: requirements depend on the city or county with authority over the property — which isn’t always the city in the mailing address — and on the scope, such as whether sheathing or framing is replaced. Ask whether your project needs a permit and who will obtain it before work is scheduled.

Items your written scope should cover

Removal of every existing layer, down to the deck
Disposal of all tear-off debris
Solid sheathing over spaced boards, if present
Decking review with photos and a per-sheet price
An approval step before additional repairs proceed
Underlayment and membranes over the new deck
New flashing, drip edge, vents, and pipe boots
Notes on any framing concerns for separate review

Cost factors

Why layers and decking move Hazel Dell roof replacement cost

Every additional layer adds labor to strip, weight to haul, and disposal cost, so a two-layer roof costs more to replace than a single-layer roof of the same size. Beyond that, the base price follows the roof’s surface area, which is larger than the house footprint once pitch and overhangs are counted. Steeper pitch, tight access, and more valleys and penetrations each add time and material.

Decking is the line that varies. A roof that needs only a few sheets and one that needs most of the deck replaced are very different jobs, and nobody can say which you have until the old roofing is gone. A per-sheet price, an agreed approval process, and a clear note about known conditions such as spaced boards keep that uncertainty manageable instead of open-ended.

More detail: what affects roof replacement cost and what a roofing estimate should include.

Comparing Hazel Dell estimates

Does each estimate assume the same number of layers?
Is a full tear-off included, or an overlay?
Is decking priced per sheet, and is an allowance included?
How is extra work documented and approved?
Is solid sheathing over boards priced up front?
Is disposal of every layer included?

Process

How a Big Bear roof replacement runs

On-site estimate
A roofing specialist walks the roof, checks shingles, flashing, and ventilation, takes photos, gathers measurements, and emails you a detailed estimate.
Review and sign
You go over the written scope and options. When you are ready, you accept the estimate online with an e-signature and we schedule the installation date.
Tear-off and installation
The crew protects the property, removes the old roof, reviews the decking with you where repairs are needed, and installs the new roof system.
Cleanup and follow-up
Debris is hauled away, the property is checked for nails and scrap, and you receive follow-up messages and photo documentation of the work.

Preparing a Hazel Dell home for tear-off

Tear-off is the loudest and messiest part of the job, and on older roofs it is when decisions come up.

Tell us where you’ve seen attic stains or ceiling spots in the past
Share any record of earlier reroofs or repairs
Plan to be reachable during tear-off in case decking needs approval
Move items stored in the attic away from the eaves, as debris and dust can fall
Clear vehicles and outdoor items from the drop zones around the house

The roof as a system

What goes into a complete new roof

Big Bear focuses on steep-slope asphalt shingle roofs, including architectural shingles and designer lines such as GAF Grand Sequoia. We don’t install flat or low-slope roofing. Exact components depend on your roof’s design, applicable code, and the manufacturer’s instructions.

Decking

The plywood, OSB, or board sheathing the roof is fastened to. It is checked once the old roof is off.

Underlayment and membranes

A water-resistant layer over the deck, with self-adhering membrane at vulnerable areas where specified.

Flashing

Metal at walls, chimneys, valleys, and skylights that turns water back onto the roof surface.

Roof edges

Drip edge at eaves and rakes, and starter courses that seal the first row of shingles.

Penetrations

Pipe boots, vents, and other openings, each sealed to suit the new roof.

Shingles

Architectural or designer asphalt shingles, installed to the manufacturer’s instructions for your roof’s pitch.

Ventilation

Intake and exhaust that suit the attic. What a given roof needs depends on its design, code, and the manufacturer.

Single-story ranch home with a new dark gray roof, white board-and-batten siding, and a cedar porch — A single-story ranch roof replacement by Big Bear Exteriors in Vancouver, WA.

Who you’re working with

Big Bear Exteriors serves homeowners in Hazel Dell, WA from our office at 1104 Main St, Ste 610, Vancouver, WA.

Washington L&I # SERDEGL826PD · Oregon CCB # 239429
Licensed general contractor in WA & OR · Bonded & insured

You can check our registration with Washington L&I. How our workmanship coverage and manufacturer warranties differ is explained on our warranty page.

Nearby service areas

See residential roof replacement or all service areas. Not sure about your address? Contact us.

FAQ

Roof replacement questions from Hazel Dell, WA homeowners

How are concealed decking repairs approved and priced?

Ask for this in writing before work starts. At Big Bear, the estimate states a per-sheet price for decking replacement. Damaged decking found during tear-off is photographed and reviewed with you before it is replaced. That way the added cost follows a price you already agreed to, and you can see why each sheet is being replaced.

Can a new roof go over the old one to avoid surprises?

An overlay hides the deck instead of fixing it, adds weight, and can affect manufacturer warranty eligibility. If there are already two layers, another one is generally not a good option. A full tear-off costs more up front but lets damaged decking and flashing be found and corrected.

What if the damage goes deeper than the decking?

Sometimes long-term leaks reach rafters or trusses. That is a structural repair, separate from decking replacement. We handle truss and rafter repairs with a structural engineer when it’s needed, and the work is scoped and approved before it proceeds.

How can I tell how many layers my roof has?

From the ground, a thick, uneven roof edge at the rake or eave is a clue. An estimator can confirm it by looking at the edge from a ladder or lifting a shingle at the perimeter. The layer count should be noted in your estimate, since it affects labor and disposal.

Is Hazel Dell in the City of Vancouver?

Hazel Dell is unincorporated Clark County, though many homes have Vancouver mailing addresses. That can change which authority handles any permit. Confirm the authority for your property and whether your scope needs a permit before the project is scheduled.

Roof Replacement in Hazel Dell, WA