Shingle Over Roof Fan

A second layer of shingles will expend heat more slowly which will shorten the shingle lifespan.

Shingle over roof fan.

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. Use the chalk line to mark the line at that spot across the roof. When i was about 16 my father installed an attic power vent fan. Let s start with the good.

This provides added protection against ice dams. You can save money because there s no dump fee for removing your old roofing and there s no need for additional felt paper over the old roof. This can cause the roof to wear unevenly. If the entrance cover was left open and the fan came on.

The uncut shingle should hang a quarter of an inch over the roof edge. Why installing new shingles over old shingles can be good. Many arizona homeowners with shingle roofs do decide to roof over their existing shingles because. The house had a removable cover to get into the attic.

See the benefits of attic ventilation a new roof is more than just shingles. It s clearly easier and cheaper to leave the old shingles in place but there s some special prep work involved with a re roof removing vents ridge caps and misshapen shingles among other things and you still have to replace or add new flashing which sometimes can be tricky over old roofing. It can also cause the new shingles to stick to the old shingles causing bulges. Residential and commercial roofing shingles slate roof ventilation roof underlayments asphaltic and tpo roof membranes.

Attic ventilation fans whether hard wired or powered by their own solar panels seem like a low cost and effective way to help keep your house cool. Position one of the uncut shingles on top of a trimmed shingle. In fact the only pro to a shingle over is it s cheaper and cleaner. The downside of attic ventilation fans.

We had a small house about 1000sf. Mark the location of the top of the uncut shingle on the felt. When contemplating a new roof many people hope to simply do a shingle over and avoid the extra cost and mess of tearing off the existing roof and starting from scratch. Roofing shingles and materials plus factory certified roofers including ratings from real homeowners from north america s largest roofing manufacturer.

However the utility of attic ventilation fans is actually quite a controversial topic. There are a couple reasons for this. Although it sounds like a good idea we can assure you the cons heavily outweigh the pros. Effective attic ventilation systems reduce damaging heat and moisture in your attic promote energy efficiency by helping to reduce the load on your air conditioner in the summer and also reduce the risk of ice dam formation on your roof.