Question: Do You Need Felt Paper Under Metal Roofing?

Can you put metal roofing over wet tar paper?

Other common shortcuts your roofer should avoid: Do not shingle over wet or damp roof sheathing or damp felt paper.

Use metal flashings where the shingles butt up to a wall, chimney or skylight.

Do not use caulking, roof tar or asphalt mixes to cover flashing materials..

Do I need furring strips under metal roof?

When installing a metal roof over an existing roof, insulate the spaces between the wood strips with rigid insulation to prevent condensation before installing the roofing. You also need to add furring strips. Correctly measure the spacing of furring strips for a metal roof to further decrease condensation.

When should I use 30lb felt?

Most standard pitched roofs only need a 15lb. felt for proper underlayment. 30lb. is used for many specialty applications such as: low pitch roofs, steep roofs (pitches over 7 on twelve), flat areas to be roofed with roll roofing, and new construction.

Is underlayment necessary for metal roof?

The simple answer is yes, your roof does need an underlayment. … Traditionally built homes will need an underlayment. If your home is built with joists, insulation between those joists, and sheathing, then an underlayment is needed before you put on a metal roof.

Do you have to use felt paper under shingles?

Answer: Roofing felt is a layer of tar paper installed beneath the shingles to provide a backup waterproof membrane in case of leakage. Felt, otherwise known as underpayment, is required when asphalt shingles are installed as a first layer of roofing or when they are applied over wood shingles or a built-up roof.

Can you install metal roofing on plywood?

The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal. Install waterproof felt over the plywood to add protection against moisture. Energy efficient and available in a variety of colors that will add value to your home, metal roofing is a wise choice for homeowners.

Do you need purlins for metal roof?

In general, purlins are used instead of traditional decking when it comes to metal roofs. With decking, A deck is a structure that separates the roofing itself from the structure, whereas the purlins will run parallel to the structure.

What can I use instead of roofing felt?

EPDMEPDM membranes are fast-becoming the roofing industry’s go-to alternative to felt and other outdated roofing materials. The composition of EPDM as a synthetic rubber compound offers superior waterproofing qualities and resistance to the elements.

What is the best adhesive for roof felt?

Black Jack 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.

How do you stop condensation on a metal roof?

Traditionally, condensation is managed by insulating the metal roof so that the panel temperature never reaches the dew point. This is often accomplished using vinyl-backed fiberglass insulation to prevent humid air from coming into contact with the cooler metal roof (which may be at or below the dew point).

Can you put metal roof on OSB?

No, you do not need to screw into solid lumber (joists, stripping,etc.). As you can see, the thinnest material they recommend is 1/2” (7/16”) OSB board at 9” on center up to 24” on center. Be sure to follow their instructions in order to obtain the warranty. Metal roofing screws need to go into framing.

Can I put metal roofing directly over shingles?

Metal Roofing Can Be Installed Over Existing Roofs Metal roofs can be installed over your existing roof without tearing off shingles, provided local building codes allow it. While shingle removal is the preferred route, tear-off is messy and raises the cost of the job.