Understanding Why A New Asphalt Roof May Appear Lumpy

If you have a new asphalt roof installed on your home, then you may be surprised to find that the roof may appear lumpy or bumpy when it is first installed. While this may seem worrisome, this is completely normal. If you want to know why these bumps or lumps appear so they can be prevented or repaired, then keep reading.

New Adhesive Strips

Asphalt shingled roofs are created in a way that they are as waterproof as possible. The waterproofing process starts with the placement of an underlayment material across the base plywood structure of the roof. This underlayment is typically made from a rubberized asphalt or fiberglass material. Asphalt shingles are then placed over this underlayment to add the next layer of protection. While the shingles are typically nailed into place, they are also secured with the help of self-adhesive strips. These strips contain either resin or an asphalt bitumen material. While the strips will secure as they are laid down on the roof, the adhesive needs time to basically melt under the heat of the sun. This helps to force the adhesive around small holes and cracks to seal the shingles properly. The shingles themselves smooth out when this happens.

Asphalt shingles should smooth out relatively quickly, especially if the roofing installation is completed in the summer. However, look out for any shingles that seem to remain bumpy or elevated several weeks after installation. While this is rare, it can happen if the roof is exposed to extremely high winds or other adverse weather conditions while the adhesive is still pliable. The adhesive on the bottom of the shingles may then not adhere properly. If this is the case, you can add more adhesive yourself. Purchase either an asphalt cement or a polyurethane sealant from your local home store. Both of these materials come in tubes that fit into a caulk gun, so purchase this gun as well if you do not have one. 

Clip the top off the sealant tube and climb onto your roof. Gently pull up the roofing shingle that appears bumpy and place a generous amount of the adhesive underneath it. Use your hand to press down on the shingle afterwards for several minutes to secure it in place.

Old Roofing Shingles

While it is wise to have your roof completely removed and replaced, it is possible to replace the top layer of shingles alone. This can reduce costs by at least $1,000. If you have a tight budget and the asphalt roofing shingles are not in extremely poor condition, then this may be your best option for a new roofing installation. However, you should understand that roofing shingles can deteriorate at different rates. As deterioration occurs, minerals on the exterior of the shingles fall off and the asphalt exterior can wear away too. In some cases, the fiberglass materials in the shingles can dry out and create an uneven appearance across the shingles. While it may not be apparent that the shingles are lumpy or uneven, you may notice that this is the case after new shingles are adhered over the old ones. Also, your home will settle over time and this may cause the roof structure to become somewhat uneven itself.

If you are concerned about your new roof looking as clean and smooth as possible, then ask your roofing contractors to add a shingle underlayment over the old shingles before the new ones are secured. This will add another layer to the roof to smooth out its appearance. The extra underlayment will also help to increase the weatherproof nature of the roof so it will last longer. It will seal off the old shingles as well, so they are unable to deteriorate any further. 

For more information, contact a company like Fischer Roofing - Flat Roof Pros