Is it OK to put new roof felt over old?

You can save money because there's no dump fee for removing your old roofing, and there's no need for additional felt paper

felt paper

Common grades include 10-, 20-, 30-, and 60-minute. The higher the rating, the heavier and more moisture-resistant the paper. A typical 20-minute paper will weigh about 3.3 lbs per square, a 30-minute paper 3.75, and a 60-minute paper about 6.

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Tar paper - Wikipedia

over the old roof. Less hassle. Installing a new roof over shingles takes less time than tearing off the old roof. Looks just as good and lasts as long.

Do you have to remove old roofing felt?

Anything the contractor does with the materials after that point is not GAF's responsibility. However, they strongly urge roofers to remove all the old felt and replace it as it is an industry best practice.

Can you lay roofing felt over old felt?

It is the process where roofers install a new roof over your existing one, i.e. add a new layer of shingles, which means that there is no tearing off of the old roof. It is important to know that this process can only be done once because you can only have two layers of shingles on your roof.

Can you put new underlayment over old underlayment?

If your manufacturer says you can put underlayment down on top of an existing install, you are good to go, but if not, you will need to completely remove the existing flooring back down to the subfloor for a proper, warrantied installation.

Is it OK to put a new roof over an old one?

While a repair job can often be more convenient and somewhat more cost-efficient, placing new shingles over old ones is never a good idea. Whether repairing one section of roof, or a replacing a whole one, it's always best to pull up the old shingles before putting down the new ones.

How to Easily Felt a Shed Roof The Right Way- DIY

How long does a roof overlay last?

An overlay is a viable option if the existing roofing materials have not already been overlaid. Home Reference.net notes that on average you can expect the overlay to last for fifteen or sixteen years.

Can you put two layers of felt on a roof?

Assuming your roofing contractor is using standard 36" wide 15# roofing felt, "double coverage" means that each layer of felt put down across the roof laps 19" over the upper half of the previous course. (The first course starts with an extra 1/2 wide run).

Should old underlayment be removed?

Roof Decking Inspection – Your roof decking has to be inspected for any wood rot or mold during its replacement. To accomplish this, your exterior services provider will have to remove the old underlayment. That way, any potential causes for damage can be spotted and repaired as soon as possible.

How often should a felt roof be replaced?

What is the lifespan of a felt roof? A felt roof will last somewhere between 10 and 20 years. The older pour and roll method of installation has now been superseded by torch-on felt which is melt welded on to a flat roof.

Is it OK to felt over existing felt?

When felting over any old felt you can use a bitten primer to get a proper fix, some felts are also a 3 layer system allowing them to go over old felt, however if he has quoted for old felt to be removed then that is what he should have done.

What roof underlayment is best?

Synthetic Underlayment

This is currently the most popular choice for roof underlayment, and with good reason. Made with an asphalt-saturated basemat and fortified with a mix of fiberglass, this product is not only extremely water-resistant, much stronger and more resistant to tears than other types of underlayment.

Can you put torch on felt over old felt?

If you are repairing an existing flat roof, it is possible to torch the felt over the material already in place provided those materials are in good shape. If your current roof is not in good nick, it makes most sense to remove any old material and start over.

Does roof underlayment need to be replaced?

The underlayment typically has much lower lifespan than the tiles, which means if you have a tile roof, you're more or less guaranteed to need to replace the underlayment eventually. A wide range of factors can reduce its lifespan such as extreme heat or cold, pests, or physical damage from debris.

When should you replace underlayment?

“Adequately protected from moisture, most subfloor materials can be expected to last for the lifespan of the home.” However, if the subfloor is consistently exposed to moisture, you may need to replace it after 20 to 30 years or sooner.

How many layers of felt should be on a roof?

Felting a flat roof requires three layers of felt, so triple the square footage in order to calculate how much felt you require.

How many layers of roofing felt Do I Need?

Generally, felt underlay roof works by combining two or three layers of material together to make an impenetrable barrier that is then coated with a waterproof finishing material to further protect the felt.

Can you nail roofing felt?

Hammer nails through the top edge of the felt at 10cm intervals. Start at the centre of the felt, rather than at either one of the edges. Ensure you pull the felt taught so that it is flat against the roof. When you get to the bottom edge, hammer the nails in at 30cm intervals.

Is a roof overlay worth it?

In the long run, an overlay roof is likely to cost more than a complete tear-off and re-roof installation project. That said, an overlay roof will save you money upfront, and can be done more quickly if you're on a time crunch.

Should I overlay my roof?

A: In general, it is not good practice to overlay a traditional asphalt shingle roof versus a complete tear off and replacement for the very reason you stated: you can't examine the decking to determine if there is any damage that needs repaired.

Is a roof overlay considered a new roof?

Tear-off roofs are when a roofing contractor removes, or “tears off,” your existing roof, then installs an entirely new one. Overlay roofs are when a roofing contractor keeps your existing roof as-is, then places new roofing materials on top of it.

Can you put rolled roofing over old rolled roofing?

Rolled roofing is very adaptable and can be cut into 12-inch by 36-inch strips to act as hips and ridges or 9-inch strips for eaves and rakes. If removing your current shingles is a problem, it is usually permissible to re-roof over your existing roof with rolled roofing.