Do you put felt under a modified bitumen roof?

Due to the inherent danger of fire, especially around felting and petroleum products, the torch-down method of installation for modified bitumen roofing should only be performed by a qualified roofer. … Install heavy roofing felt with overtop your decking, old roof or insulation.

Can you shingle over modified bitumen?

For slopes less than 9,5° we cannot install roof shingles. Instead the roof must be done with a modified bituminous membrane (e.g. Armourvalley) or other materials like EPDM, PVC or TPO covering.

How do you install bitumen felt?

The basics of these steps are:

  1. Preparing the roof for the felt to be laid.
  2. Laying the first underlay felt.
  3. Laying the second boded underlay felt and adding any gutter drips.
  4. Laying the top bonded layer of felt.
  5. Installing any verge edge and edging to any flashings and vertical walls.
  6. Complete the finishing touches.


What is a modified bitumen roof?

Modified Bitumen (MB) roofing is an asphalt-based, close cousin of the Built-up-Roof (BUR) designed for buildings with low-slope or “flat” roof structures. … Modified Bitumen Roofing Systems are designed to withstand harsh exposure to extreme environmental elements.

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What is the life expectancy of a modified bitumen roof?

It is important to notes that modified bitumen roofs have a solid roof lifetime of approximately twenty years. This is an estimate that does not include good roofing maintenance.

When should a bitumen roof be replaced?

Common Signs Pointing a Need to Repair or Replace Modified Bitumen Roofing

  1. Worn asphalt – spots/areas of surface erosion that expose underlying layers.
  2. Delamination – individuals layers have separated/slipped thus durability is lost.
  3. Tears, Cracks, Punctures – outward damage due to weather, falling debris, etc.


Can you repair a modified bitumen roof?

Luckily, when modified bitumen coating is damaged, repair is possible! There are a few different ways it can be handled, although applying a patch is the most common method.

What goes under torch down roofing?

A mat of fiberglass, polyester, or other material is often used as a sturdy core for torch down roofing membranes. Manufacturers also may embed small granules into the top of the membrane to add fire resistance, color options, ultraviolet (UV) radiation protection, or other distinctive characteristics.

Do you need felt under roll roofing?

Roll roofing is often installed over bare wood sheathing or sheathing that has been painted with a primer. Applying roofing felt first will better protect the sheathing against condensation, as well as against leaking.

What is the best adhesive for roof felt?

EVERBUILD BLACKJACK 904 Bitumen Roof Felt Adhesive is the ultimate cold applied, bitumen-based adhesive used to bond roofing felt to most surfaces metal, concrete, timber and more. It provides an incredible high bond strength which delivers a tough but flexible film that hardens and softens with changing temperatures.

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Can you nail torch-on felt?

Roofing felt is a simple and cost-effective countermeasure against wind-driven rain and serves to keep flat roofs, garages, and sheds watertight. … These include Cold Adhesive, Torch-on and Shed.

Do you need adhesive for Shed felt?

no need for adhesive. 90% of sheds have none. just get a good lap on the felt.

What is another name for modified bitumen roof?

Mod-bit roofing(MB) is a shorter way to say modified-bitumen roofing. MB roofing systems are a durable, weather resistant type of low-slope roof. Mod-bit materials are sold in rolls, and its seams are sealed using heat (the common open flame torch), hot- or cold-applied, or self-adhering.

How much does it cost to install a modified bitumen roof?

Modified Bitumen Roof Average Costs

Bitumen roofs cost approximately $2.50 to $4.00 per square foot installed. For a 1,500 square foot roof, that’s a total cost of $3,750 to $6,000.

Which is better TPO or modified bitumen?

TPO can be reheated which means you can weld seams when needed. They have a smoother surface than the granulated surface of bitumen roofing, which makes them easier to clean. TPO membranes are typically much thicker than other roofing options, which better protects your roof from falling debris and tears.

Roofs and roofing