Second Roof Layer

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

Second roof layer.

Extra heat causes shingles to curl and break down much more quickly. Adds value a brand new tear off roof can add to your home s resale value and is a major selling point. Residential roofing codes allow your roof to have a grand total of two layers of roofing. How to shingle over existing shingles and how to shingle a roof how to install roof shingles shingle layout lines h.

The second layer is also more difficult to install properly compared to new shingles. Replacing a roof can be very expensive and exhausting at the same time. This is mostly due to the fact that a brand new roof traps much less heat than a roof with multiple layers. A roof is one of the most vital components of a house.

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. Flashing around roof penetrations and sidewalls can be compromised. Select a length of roofing nails that penetrates completely through the new layer of shingles existing layer and the wood roof deck. This provides added protection against ice dams.

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. Pros and cons of adding a second layer 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. Plus depending upon the size of your roof you ve added multiple tons of weight which could pose a big problem if there is significant snow accumulation.

Re roofing used to be pretty straight forward with 3 tab shingles. 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. Posted july 31 2018 by onpage marie. If you don t tear off the old layer you can t examine the decking.

The additional weight of multiple layers may also be more than the roof supports can bear. Inspect your attic for cracked or sagging rafters a sign that a layover could cause more damage. You cannot afford to remove the existing roofing. Roofing second layer of shingles roofing.

Installing a second layer is only advisable if. Most people would limit this practice to a total of two layers of shingles. 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. So if you re thinking of selling your home a few years.