Will radiant barrier damage shingles?

By blocking the mass insulation from absorbing heat and emitting it back to the roof, a radiant barrier can decrease the roof temperature at night by over 5 degrees. In short, radiant barrier should not void any shingle manufacturer’s warranty and will not damage roof shingles or any other roofing material.

Can you put a new roof over an old roof?

Roofing over an existing roof is also called reroofing or an overlay. 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.

Are radiant roof barriers worth it?

Radiant barriers are more effective in hot climates than in cool climates, especially when cooling air ducts are located in the attic. Some studies show that radiant barriers can reduce cooling costs 5% to 10% when used in a warm, sunny climate.

Can you put underlayment over shingles?

An underlayment is meant to go over existing shingles to give added protection. This added protection then gives an extra layer of waterproofing to avoid leaks that may start due to old shingles with cracks and slight damage. Note: A new underlayment will not be a quick fix for major damage to a shingle roof.

Does radiant barrier attract lightning?

Radiant barrier sheathing (RBS) is an extremely efficient ignition source for structure fires and it exhibits some most unusual (even strange) behavior patterns. A roof constructed with RBS material appears to actually attract lightning.

Can you put new shingles over old shingles?

You might be able to lay new shingles over existing shingles and avoid the cost of tear-off. If conditions are right, new shingles laid over old shingles can be just as attractive and durable as shingles laid on bare sheathing. But you must take care to install shingles correctly so they lie flat.

Should shingles be removed before metal roof?

Considerations for Both Options Your local roofing contractor may recommend tearing off your old shingles before installing a metal roof if any of the following conditions apply: Rough or uneven asphalt shingle roof will affect the metal roof’s appearance. The deck sheathing show signs of rot and would require repairs.

What’s the best way to roof over old shingles?

If a shingle is torn or cracked, glue the broken piece back in place using roofing cement. If the broken piece is lost, cut a piece to fit. The goal is to provide a reasonably flat surface for the new shingles to lie over, with no gaps greater than 1/2 inch.

Do you put insulation on your roof before you lay shingles?

Insulation in the walls and attic are installed without question, but many people neglect insulation on their roof, even though that’s where much of a house’s energy leaks out. Installing rigid foam insulation on your roof before you lay your shingles can help make your home more comfortable and energy efficient.

What’s the best way to install a roof over an existing roof?

Place the top of each starter shingle firmly against the bottom of the shingle immediately above it and even with the eaves, then nail it into place. Use 1.5- or 1.75-inch roofing nails. Your second row of shingles should be cut to 10 inches wide. Butt these against the bottom of the old roof’s third row and nail into place.

Can you put new plywood over old shingles?

Because the plywood roof sheathing under the shingles has become brittle and weak, he plans to install new plywood as well as new shingles. But can he simply install new plywood over the old plywood sheathing to avoid the extra time, expense and attic debris that he believes removing the old plywood would entail?

What kind of roofing do you put over existing shingles?

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

Can a new roof be installed over an old roof?

There’s anecdotal evidence that new shingles installed over old shingles won’t last as long as a single-layered roof, most manufacturers offer the same warranty for both methods. However, if you are planning to keep the house for the long term, we suggest ripping off the old shingles so you can:

Can you put plywood on top of shingles?

Also, make sure that the roofing nails used when the shingles are installed are long enough to penetrate both layers of plywood. Another concern is that the roof will have added weight if new plywood is installed without removing the old.