On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.
How many layers of shingles are allowed on a roof in texas.
Most cities and towns allow a maximum of two layers of shingles says chad muth president of muth company roofing in westerville ohio.
I live in milford pa how many layer of asphalt are allowed on a roof.
The manufacturer should indicate compliance with these requirements on the shingle wrapper.
Other factors to consider.
Adding a second or third layer of shingles adds significant weight to the structure.
You can find asphalt shingle product and other roof covering product.
Re roof or strip the roof down.
For example cedar or tile roofs are only allowed one layer.
Ii all tile shall be thoroughly watered with a hose before application.
The soundness of the building you re re roofing is another consideration.
The average 30 square roof uses 90 bundles of shingles and a bundle of asphalt roofing shingles weighs about 100 pounds which means you re putting roughly 9 000 additional pounds of weight on your roof.
For many years it was acceptable to put even the third layer.
Three layers of roof shingles too many for an insurance company.
I m not sure about milford but i personally would never have more than 2 layers for all the reasons stated in my post above.
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.
If you are using asphalt shingles on your roof select shingles tested to meet the astm d 3161 class f or astm d 7158 class h requirements.
Structures in texas is asphalt shingles.
I tile roofing shall be laid over not less than one layer of 30 pound asphalt felt securely fastened by nailing with tin caps.
If the current roof is in poor shape re covering may not be a sound choice.
Steep sloped roof products such as tile slate metal and shakes only allow one layer.
Asphalt shingles typically can have one more layer added over the top two roofs total.
Iii nails that secure roll roofing to the roof deck shall be driven at least 3 4 of an inch from the edge of the sheet.
December 18 2019 by taylor made roofing signs that your roof has reached the end of its life are typically fairly obvious.
How many layers of shingles are allowed on a roof.
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.