The contractor may do a walk on the roof and also inspect from the attic for any rot before installing a second layer of shingles.
How many layer of roof shingles.
So we ll start at the bottom of the deck and work our way up through all the roofing layers until we reach the shingles and sunshine above your roof.
In some instances 3 layers may be allowed but this is rare.
Most cities and towns allow a maximum of two layers of shingles says chad muth president of muth company roofing in westerville ohio.
Shingles are the element that most homeowners are familiar with as it is the layer you can see from the outside of your home and it is an important aesthetic aspect.
On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.
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.
Checking building codes in your area is an important first step.
If the structure can support the added weight a typical 20 square 2 000 square foot reroof will cost at least 1 000 less than a tear off job.
Depending on climate and weather some areas may only allow one layer.
That limit pertains to roofs with up to a 4 12 pitch.
Framing includes the roof trusses that sit at the top of your house and support the weight of all the materials used to build your roof.
Many roofers recommend using laminated or dimensional shingles for re roofs because they re thicker than.
Re roofers have tricks to lay new roof shingles over old so that the same step ups between courses are maintained but if any old shingles are cupped curled or otherwise misshapen those defects will telegraph through to the new layer.
Most building codes allow up to two layers of organic or fiberglass asphalt shingles.
Benefits of adding multiple shingle layers.
Asphalt shingles come in two major types 3 tab and architectural.
So how many layers of roof shingles are allowed.
3 tabs are less expensive but also less durable have lower wind resistance and have a flatter appearance.
Most building codes allow two layers of organic or fiberglass asphalt shingles on roofs with a 4 12 pitch or less and three layers on steeper roofs.
Steep sloped roof products such as tile slate metal and shakes only allow one layer.
Bring the ridge edges together with a ridge capping layer.
How many layers is too many there are a variety of factors that determine how many layers of shingles a homeowner can have on a roof including.
Most areas only allow for a maximum of two layers.
When it s time to replace your roof there are several factors that might lead your roofing professional to.
For many years it was acceptable to put even the third layer.
You ll need longer nails for this part as you re driving through more layers of shingles.
This will also be constrained by other factors.
Now you just have to decide whether to remove the existing roof shingles or recover the roof.
Roofing layers from the framing to the shingles.
