Do you know the difference between tear off and overlays in roofing? This is something a number of people are wondering. If you have a composition shingle roof, you might have to pick between these two options.
What is the difference between tear off and overlays in roofing? This is something a number of people are wondering. If you have a composition shingle roof,
you might have to pick between these two options. Here is a description of each:
Tear off
This is when you tear off the old shingles to make room for the new ones. This is the most expensive option, because of labor and removal costs. It isalso the more time consuming option.
Overlay
An overlay is where you simply put new shingles over the current ones. This is obviously less expensive and faster than the previous option. This is the one everyone would prefer to go with, if given the choice.
Which should you undertake?
There are a number of factors that determine which you should undertake. Generally speaking, if you have a single layer roof that lies flat then you can go with overlays (assuming the roof deck is structurally sound).
If you have multiple layers of the roof, then a tear off often must be done-at least for one layer. The reason is that many places require you to have no more than 2 roof layers, because of the building codes. To find this out, call up the building inspector’s department in your area.
Also, check the underlying structure. It needs to be strong, because adding new layers adds weight to the previous layer. If the previous roof is sagging, it might not be able to handle the new layer.
How can you tell if the roof is strong?
If you see spongy areas when walking on the roof, or if you notice sagging between the rafters or the trusses, then the deck might be damaged. In this instance, a tear off will often be necessary.
If you do need a tear off, you obviously have to get rid of the current roof. To save money, you might want to consider hauling the debris away to a waste disposal station yourself. You could invest in a demolition dumpster, but this is often more expensive. Since the tear off process is already pricey, you might want to consider the former option. It really depends on your budget and costs in your area.
Whether you do a tear off or overlays really depends on your current roof and the building codes in the area. Do not forget: no matter which option you choose, you definitely want to keep the attic ventilated correctly. Use this information, and you will be on your way to the correct new roof for you.
