Steep sloped roof products such as tile slate metal and shakes only allow one layer.
How many layers of roofing are allowed in washington state.
Eliminating the tearoff can easily save 1 000 or more on a new roof but you re really just delaying the cost.
For example if you already have 2 layers of asphalt composition shingles on your roof you cannot add a third.
New roof coverings shall not be.
Asphalt shingles typically can have one more layer added over the top two roofs total.
The previous code allowed up to three layers of roofing before removal was required.
For more information or questions contact micheal d.
On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.
When it s time to replace the roof again and you have no choice but to start anew two layers is the maximum allowed in most areas you ll have to pay extra for the two layer tearoff and disposal.
Ewert at 503 373 7529 or e mail questions to mike d ewert state or us.
Although the new york state building code does allow for up to two layers of roof materials.
If it s 15 years old and they ve noticed loose granules washing off the shingles or running out of the downspouts it s a reroof candidate.
Once you have discovered how many layers of roof shingles are allowed the next decision you should make is whether you will have the existing shingles completely removed to make way for two or three new layers or whether you will have another layer of shingles placed on top of the existing layer.
Now you just have to decide whether to remove the existing roof shingles or recover the roof.
Should i have my old roof removed before a new one is installed.
But contractors who spoke with angie s list say best practices call for stripping the roof down to the wood deck to inspect it before installing a new roof.
For many years it was acceptable to put even the third layer.
If the roof is say eight years old it probably just needs a repair.
When they tell me what neighborhood they re in i can also make a good guess about how many layers of shingles are already on the roof.
Roof coverings such as shingle tiles rubber plastic or metal must be rated as a class a fire retardant material.
Any amount of short term savings you might see from a layover roof installation is not far outweighed by the longer term peace of mind that comes from knowing that the integrity of the decking has been confirmed.
R907 3 recovering versus replacement.
Re roof or strip the roof down.
B if the original asphalt roofing material is not removed and a second layer of asphalt roofing is added an engineering analysis must be completed to ensure that the existing roof structure can support the additional load while maintaining a 20 pounds per square foot psf live roof load or maintaining the specified roof load listed on the.
