Second Roof Layer

Flashing around roof penetrations and sidewalls can be compromised.

Second roof layer.

Replacing a roof can be very expensive and exhausting at the same time. So if you re thinking of selling your home a few years. Pros and cons of adding a second layer of shingles. The second layer is also more difficult to install properly compared to new shingles.

Adds value a brand new tear off roof can add to your home s resale value and is a major selling point. If you don t tear off the old layer you can t examine the decking. Posted july 31 2018 by onpage marie. Re roofing options to tear or not to tear off.

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. Select a length of roofing nails that penetrates completely through the new layer of shingles existing layer and the wood roof deck. You can t know for sure that there aren t any soft spots or. A roof is one of the most vital components of a house.

Re roofing used to be pretty straight forward with 3 tab shingles. Most people would limit this practice to a total of two layers of shingles. 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. This provides added protection against ice dams.

Residential roofing codes allow your roof to have a grand total of two layers of roofing. You cannot afford to remove the existing roofing. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h. For a second layer to be as good as a roof tear off you would have to have sound decking no leaks and a roof with no sidewalls where flashing is needed in order to tie the tiles in to the exterior walls.

Installing a second layer is only advisable if. Inspect your attic for cracked or sagging rafters a sign that a layover could cause more damage. Sometimes going over the top of your existing roofing is a cost saving alternative compared to removing the existing roofing and then installing new roofing. The additional weight of multiple layers may also be more than the roof supports can bear.

However installing new flashings including special drip edge flashings made for reroofing will ensure a tight seal and a long life. This is mostly due to the fact that a brand new roof traps much less heat than a roof with multiple layers. Apply the shingles to all roof planes ending a row of shingles at the top of the plane which is the ridge or peak and cut to follow the profile of any outside corners. Extra heat causes shingles to curl and break down much more quickly.