Reroofing in Boise is rarely as simple as nailing new shingles over old ones. City code caps a roof at two layers, and many older homes already have them. Sage Roofing checks what is up there now, tells you whether an overlay is even legal, and re-roofs down to solid decking when it is not.
Share a few details and we'll set a time to count your layers and check the deck.
A re-roof replaces the roof covering on a house that already has one. In Boise that describes most jobs. About half of the city's homes were built between 1970 and 1999, and plenty of them have already been roofed once.
The big question is what comes off. Boise code allows no more than two roof layers, and an overlay is only allowed over a single existing layer. If your home already carries two layers, the next roof starts with a full tear-off. No exceptions.
Even when an overlay is allowed, it hides the deck. We talk through the trade-off honestly. A tear-off lets us see soft sheathing, fix old flashing and correct ventilation instead of burying problems for another 20 years.
A re-roof is also your chance to change what the original builder chose. Many 1990s subdivision homes went up with basic 3-tab shingles and minimal attic venting. Moving to architectural or impact-resistant shingles from GAF, Owens Corning, CertainTeed or IKO, adding proper ridge and soffit ventilation and upgrading flashing can make the second roof outlast the first by a wide margin. If you live in the foothills, a Class A rated system is required inside the Wildland-Urban Interface, so the new roof has to meet that standard too.
See If My Roof Can Be OverlaidSome clues show from the street. Others only show once we are in the attic or pulling back a shingle.
Look at the edge of the roof from a ladder. If you see two stacks of shingles, Boise code means the next job is a tear-off. Extra layers also add weight to a roof built for a 20 psf ground snow load.
Soft spots underfoot or a wavy roofline point to tired sheathing. It is common on roofs that held water from ice dams or old leaks. We replace bad boards before anything new goes down.
Most of Boise's moisture falls November through May. Stains on ceilings after a thaw often trace back to failed flashing or ice dams at the eaves, not just the shingles.
Granules in the gutters and curled tabs mean the shingle has done its job. Boise's hot days and quick-cooling nights work shingles hard, and older 3-tab roofs show it first.
A re-roof on a North End bungalow is a different job from one in a West Boise split-level. Here is what we usually find when we climb up, and what it tends to mean for the job ahead. Every roof gets its own inspection, but knowing the era of your home gives us a good head start.
Victorian and Craftsman homes here often hide several past roofs and older board decking. Homes in historic overlays need a Certificate of Appropriateness to change roofing material, so we confirm the district rules before you pick a product.
Post-war ranch and Minimal Traditional homes on the Boise Bench are simple roofs, but many are on their third covering. Expect a full strip-off, new underlayment and updated attic vents.
The 1970s through 1990s tract and split-level homes here make up a big share of the city. Many still wear their first or second roof, which is often where an overlay versus tear-off decision comes up.
Most jobs take 1–3 days once work begins. Here is the order we follow, so you know what the noise on your roof means at every hour. We keep you posted at the start and end of each day, and we tell you right away if the deck needs more work than we expected.
Schedule My Free Re-Roof CheckWe cover landscaping, set tarps along the walls and park the dump trailer where it won't block your driveway.
Old layers come off down to the sheathing. On a two-layer roof that is a lot of material, so we haul as we go.
We walk every sheet, replace soft or rotted boards and re-nail loose ones so the new roof has a solid base.
New underlayment, drip edge and fresh flashing go on at walls, chimneys and valleys, plus vents sized for the attic.
The new roof goes on, magnets sweep the yard for nails and the City of Boise final inspection closes the permit.
0% interest for up to 18 months, or long-term plans as low as $149 a month, on approved credit. Surprise decking repairs are the usual worry on a re-roof, so we note likely problem areas in your quote up front.
Only if there is a single existing layer. Boise city code allows a maximum of two layers, and overlays are allowed only over one. If your roof already has two layers, both have to come off before the new roof goes on.
Yes. The City of Boise lists re-roofing an existing structure as work that needs a building permit. It is filed as application type 428, Residential Roofing, Siding and Windows, and it must carry the contractor's Idaho registration number.
It means a full tear-off, which takes more labor and more disposal than an overlay. It also gives us a clear look at the decking. Most re-roofs still finish in 1–3 days once work begins.
It can. Homes in Boise's historic overlays need a Certificate of Appropriateness to change roofing material. Re-roofing with the same material, or changing to composition shingle, is listed as a staff-level item, but we confirm your district first.
Often, yes. Homes from the 1990s or earlier are the ones most often linked to ice dams from poor attic ventilation in the Treasure Valley, and that moisture can rot sheathing. We check every board during the tear-off.
It is the best time. With the old roof off we can add intake and exhaust vents in the right places. Better airflow helps with ice dams in winter and heat buildup in Boise summers.
We re-roof homes in Boise ZIP codes 83702, 83703, 83704, 83705, 83706, 83709, 83712, 83713, 83714 and 83716. That includes the Hyde Park area, Collister, the Central Bench, Vista and Warm Springs Mesa.
Learn more about our roof replacement services or see all roofing services.
Roof replacement in BoiseNew roof in BoiseRoof installation in BoiseRoofing company in BoiseRoofing contractor in BoiseRoofers in BoiseRoof replacement cost in BoiseShingle roof replacement in BoiseMetal roof replacement in BoiseInsurance roof replacement in Boise
We'll count the layers, check the deck and tell you if a re-roof makes sense right now.
📞 Call (208) 994-5919 Get My Re-Roof Quote
Roof replacement, repair and metal roofing across the Treasure Valley. Manufacturer warranties up to 50 years, and still answering the phone after the job is done.
Copyright © 2026 Sage Roofing. All rights reserved.
