Bur systems are redundant meaning if one layer breaks down multiple remaining layers provide immediate protection.
Flat roofing layers.
On the plus side.
Removing the old roof.
These flat roof systems contain one layer of rubber or a rubber type material that is applied without heat.
Asphalt shingles typically can have one more layer added over the top two roofs total.
For many years it was acceptable to put even the third layer.
The number of plies on a roof implies the number of layers i e.
Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board.
Depending on the product of roofing that the flat roof currently contains the roof can have a specific number of layers.
Drawbacks include potential leakage at the seams or from product shrinkage.
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.
Built up roofs or burs also called a tar and gravel roof is a well established and popular style of flat roof that is made up of alternating layers of roofing felt or fiberglass and asphalt that is applied with heat which combine to make a long lasting sturdy roofing system.
Adhesive metal straps or gravel are used to secure the rubber roof systems.
Modified bitumen cap sheet roofing was developed in the 1960s as a replacement technology for.
Lever against the.
Four plies denotes a four layer flat roof membrane system.
From there the flat roof system you choose will determine the materials you apply.
Roof products with steep slopes such as metal slate tile and shakes may only be able to have one layer without becoming a problem.
On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.
Asphalt shingles come in two major types 3 tab and architectural.
Different types of flat roof material options single layer membrane roof.
Plies are the layers of felts fabrics and mats that make up roofs.
Remove the plies of the flat roof by thrusting into them with a spade.
3 tabs are less expensive but also less durable have lower wind resistance and have a flatter appearance.
Pvc single ply membrane arguably the most popular of all flat roofing materials some contractors even install only pvc membranes for higher end residential installations pvc membranes are a single layer of thermoplastic material.
Steep sloped roof products such as tile slate metal and shakes only allow one layer.
