One Layer Roof

Adding a second layer could compromise the structure of your roof.

One layer roof.

Roofing felt underlayment layers. However some areas on the roof have up to five layers of shinles. A built up roof for example will typically include the built up membrane itself with or without gravel as well as some kind of insulation and cover board which will vary in thickness from roof to roof. Double layer or double coverage roofing underlayment are defined here.

The cost associated with the material and installation can vary widely depending on roof conditions the attachment used and the type of membrane being installed. I have an itemized quote for a 28 square single story roof including a detached garage in los angeles ca. Often there is a problem with the first layer of shingles that was not apparent. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin.

When it comes to estimating the weight of an existing roof field. This provides added protection against ice dams. Single ply roofing is priced per square foot and an average price for materials and installation of a 60 mil roof may range from 3 to 5 per square foot. Most often made out of plywood this roof layer is installed over the framing in a typical roof install.

If you intend. New materials are 5 500. Having an old layer of roof shingles under your new layer accelerates that process as the original layer holds a lot of heat. Many roof decks were designed to handle only one layer of shingles.

We explain when double coverage of felt underlayment is recommended and we describe how to figure out if your roofer installed a single layer or double coverage layer or maybe no layer of felt under the roof shingles. The tear off quote is 4 000. A second layer of shingles only complicates the job when a roofer is trying to fix a leak. Ice water barrier this self adhering water proof and self sealing membrane is applied to the roof deck.

As a result you ll typically lose one quarter to one third of the roof life. The additional weight of multiple layers may also be more than the roof supports can bear. Note that roof systems typically include more than one type of material. You can usually see the underside of plywood decking from the attic.

Installing new roof shingles over old effectively doubles the weight of the roofing so you have to make sure your roof structure can handle the extra load. Single ply roofing cost. Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing. On the flip side removing the original roof shingle layer drives up the replacement cost so the decision is an economic one.

It provides structure by tying the trusses and joists together.