One Layer Roof

Often there is a problem with the first layer of shingles that was not apparent.

One layer roof. Single ply roofing cost. A second layer of shingles only complicates the job when a roofer is trying to fix a leak. However some areas on the roof have up to five layers of shinles. 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.

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. Double layer or double coverage roofing underlayment are defined here. Inspect your attic for cracked or sagging rafters a sign that a layover could cause more damage.

It provides structure by tying the trusses and joists together. The additional weight of multiple layers may also be more than the roof supports can bear. As a result you ll typically lose one quarter to one third of the roof life. Note that roof systems typically include more than one type of material.

Roofing felt underlayment layers. New materials are 5 500. The roof has varying number of layers with most areas having two layers of old shingles. Chances are your roof structure was designed for a dead load of one layer of shingles plus extra for snow and a safety margin.

I have an itemized quote for a 28 square single story roof including a detached garage in los angeles ca. 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. You can usually see the underside of plywood decking from the attic. Ice water barrier this self adhering water proof and self sealing membrane is applied to the roof deck.

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

Most often made out of plywood this roof layer is installed over the framing in a typical roof install. Having an old layer of roof shingles under your new layer accelerates that process as the original layer holds a lot of heat. This provides added protection against ice dams. When it comes to estimating the weight of an existing roof field.

However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life.