5 Common House Wrap Mistakes Contractors Make

May 11, 2018
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 One of the main factors in eco-friendly construction nowadays is to make sure that moisture buildup is taken care of. That is done through the utilization of a building wrap. Every year, homes are having to get new siding, replacing doors or windows, etc. and this is the prime time for you as a construction leader to check the areas behind the siding and around windows to see what type of moisture exposure the home or commercial site has. 

While a house wrap is a great idea, many contractors make mistakes that can totally defeat the purpose of the wrap.

Here are five common mistakes contractors make when wrapping a building that you want to avoid. 

Coverage Not Complete 

The regulations for using a building wrap state that it has to overlap the pieces by at least 12-inches at each corner and use an adhesive that is acrylic backed. Unfortunately, when building contractors are rolling it out, it can sometimes be shorter because it is not pulled tightly against the inside edge as it should be. This can leave gaps in the product and cause the building wrap to not perform its job properly. 

The Intersection of Roof and Wall 

Another aspect that has issues when installing a house wrap is where the roof and wall intersect. A roof can take on 1250 gallons of water at a time when there is an inch of rainfall. When it is windy during this rain, the wall acts as a roof and takes on a lot of water. If the intersections are not sealed tightly of the house wrap, it can cause water to get behind the wrap itself. 

Penetrations in the Wall 

Another area that needs to be watched out for is penetrations in the wall itself. The flashing around pipes or other protrusions from the home should be measured properly. If you cut the hole bigger than it is needed, it will allow water to get behind the house wrap. That totally defeats the purpose of protecting the home from water or moisture which can, in turn, lead to costly repairs. 

Improper Sealing Around Doors and Windows 

Cutting around doors and windows also has to be taken into consideration. If you’re trying to protect the home from moisture, you want to make sure every flashing is fit properly. This means around doors, windows, plumbing etc. Make sure to measure properly around the doors and windows before cutting your building wrap. You want the wrap to fit snugly against every flashing to prevent water from seeping in behind it.

Incorrect Sealant and Head Flashing on Windows 

You need to also be aware of the head flashing on windows and that the sealant is used properly. This can be an issue as the rain or water rolls down the side of the wall towards the window. If it is not sealed correctly, this can lead to the water getting behind the wrap. 

House wraps and building wraps paired together with a sturdy exterior wall sheathing are a great way to seal a building from moisture when installed correctly. Make sure to avoid these common mistakes as you add this layer of protection to clients’ homes.


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