What roofing underlayment should I use on my Tri-Building? I recently read an article in an online real estate newsletter that asked this question. The newsletter did not mention a specific manufacturer but one of the sub manufacturers that could have supplied the product was mentioned.
As a professional engineer who has built over 30 homes over the last two decades, I am very aware of the need for proper protection of roof surfaces. My question to the editor was “What roofing underlayment should I be using on a newly constructed Tri-Build”? My goal is to protect the structural integrity of the roof system. I am not concerned with aesthetics. This was just my thought process while reading the article.
There are a variety of products on the market from a variety of manufacturers. Some roofers choose to use an open cell type product that would provide excellent coverage for any budget. These products will also allow for the flexing and expanding necessary for any type of roofing application. The disadvantage to this type of underlayment is that it can be heavy and needs to be used in conjunction with another type of underlayment or you may find that it causes structure buckling and movement.
Another choice is a rubber product that is sprayed onto the roof. This product provides a lot of cushion but is much heavier. It is used as the foundation of a floating roof. You would never use it on a pitched roof. If you are looking for the lowest cost product then I would recommend this option. This is another product that can be heavy and if you have a larger roof, such as a tile roof, you will want to use another underlayment manufacturer for the heavier roofing system.
A final option is one of the synthetic materials that are available. Most people use these for their home applications because they are the cheapest option. The benefit of using this type of product is that you will notice less condensation. The downfall to using this product is that you will notice a drop in the durability of your roof. The product itself can start to deteriorate after years of being used.
So there you have it. I hope that this article is of assistance in deciding which type of roofing underlayment you should use. Don’t purchase any underlayment until you have done your homework and have chosen the product that fits your exact application requirements. Only then should you begin to install it. Good luck and happy building!