One Layer Roof

However some areas on the roof have up to five layers of shinles.

One layer roof.

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. Adding a second layer could compromise the structure of your roof. When it comes to estimating the weight of an existing roof field. Double layer or double coverage roofing underlayment are defined here.

New materials are 5 500. Inspect your attic for cracked or sagging rafters a sign that a layover could cause more damage. However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. The tear off quote is 4 000.

You can usually see the underside of plywood decking from the attic. If you intend. This provides added protection against ice dams. On the flip side removing the original roof shingle layer drives up the replacement cost so the decision is an economic one.

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. Roofing felt underlayment layers. Note that roof systems typically include more than one type of material. Having an old layer of roof shingles under your new layer accelerates that process as the original layer holds a lot of heat.

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. Many roof decks were designed to handle only one layer of shingles. 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. A second layer of shingles only complicates the job when a roofer is trying to fix a leak.

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. The additional weight of multiple layers may also be more than the roof supports can bear. The roof has varying number of layers with most areas having two layers of old shingles. I have an itemized quote for a 28 square single story roof including a detached garage in los angeles ca.

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. It provides structure by tying the trusses and joists together. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin.

Most often made out of plywood this roof layer is installed over the framing in a typical roof install.