2 Layers Of Shingles On Roof

When a home has two layers of shingles the trusses are supporting twice the normal weight of a single layer roof.

2 layers of shingles on roof. If i am reading it wrong or using an outdated amendment please correct me. A bundle or package of shingles weighs about 70 pounds depending on the type of composition shingle. However the truth is so many variables have to be just right in order to make it work that it s much more likely to cost you money in the end. Ask your roofer about recycling options for old shingles.

Posted july 31 2018 by onpage marie. On a 1 200 square foot home that s an additional 3 000 to 4 000 pounds of shingles for the second layer. Moisture can get trapped under the heavy layers and cause premature rotting of the wood. Why roof shingles work best in single layers.

The way i read this is 2 layers of roofing are allowed when see above. They seldom consider that in 15 years when their roofing once again fails they will have to pay significantly more to have someone remove both layers of shingles and apply new ones. Overlay will not work well at all with dimensional shingles only three tab. If you have done some serious research on roofing then you have probably heard about adding a second layer of shingles on top of the old ones.

The temporary savings you receive from adding a second layer of shingles does not outweigh the negative aspects. Old shingles are used by local municipalities in roswell and other local towns to create roads. Having multiple layers of shingles is going to make your roof hotter because the heat gets trapped between the layers which could mean premature aging of the shingles. You do add excess weight to the roof framing which can cause the decking and or roof joists to bow and cause a ripple effect in the roof.

Replacing a roof can be very expensive and exhausting at the same time. To transmit the roof loads directly to the building s structural system and that do not rely on existing roofs and roof coverings for support shall not require the removal of existing roof coverings. This is especially true if you ve overlayed your new shingles on top of warped shingles. When shingles laying on two roof planes approach each other in a valley weave the layers of shingles across the valley to create an integrated unbroken water barrier across the valley.

The biggest mistake people make when layering roofing is to purchase cheap shingles for the new roof. A roof is one of the most vital components of a house. Pros and cons of adding a second layer of shingles.