This is an example of poor deck flashing, which can ultimately ruin the structure of your deck and result in deck failure. Our deck flashing process entails removing the siding in order to insert an L-piece of flashing, then re-installing new siding, and placing the deck boards on top. By doing this, rainwater will exit away from your home so that it doesn’t get behind the deck flashing and cause rot.
Archive for the ‘Porches & Decks’ Category
Deck flashing can make or break the structure of your deck. Here’s how it works: you have your main house structure, your band board, half an inch of sheathing, and then siding. At John Temmel Siding Guy, this is our deck flashing process: we cut and remove the siding at the band board, insert a large L-piece of flashing, install siding, and place the floorboards on top so that when it rains, the water will exit away from the house. This is the end result you want because the water won’t leak into the structure of your home causing rot. When deck flashing is poorly installed, water will go behind the deck and rot the structure of the house, which will result in deck failure. “I have been telling people for years that you have to flash the deck up to the coat. You have to make sure the water exits away from the structure, otherwise there is going to be a catastrophic deck failure,” says John Temmel on deck flashing. Deck failure as a result of improper deck flashing happens only with siding houses, which is why it’s important to get your deck checked out if you fall in this category!
Photo Credit: aberenyi / photoxpress
John Temmel Siding Guy believes in investing the money in quality deck lumber. Here’s why. Standard lumber goes through a pressure treatment process before it gets shipped. During this process, the wood is injected with chemicals to preserve it so that it won’t rot. When the wood finally reaches the customers, there’s about 40% moisture in that wood from the chemicals. This means that when you build your deck, the wood will dry out because the moisture tries to escape, which results in a cracked and unpleasant looking deck after several months. The best way to get a beautiful, quality deck is to obtain wood that goes through the following process: Kiln-Dried-After-Treatment (KDAT). During this process, the wood is placed inside a kiln and dried so that when it’s delivered to the customer, there’s only about 15% moisture in the wood. That’s a difference of 25%, which makes a huge difference in the aesthetics and quality of your deck. Although this type of upgraded lumber can be pretty costly, it’s well worth it if you want your deck to last.
A deck post should always be placed on top of footing, not inside concrete because it can break. The photo on the left shows a post set in a bracket that has been mounted to the top of a footer. The photo on the right shows a post that has concrete poured around it, which can lead to a crack like you see here. When concrete is poured around a deck post in this way, the post will rot due to moisture buildup by the soil. Concrete tends to absorb moisture and wood expands when it gets wet, so these two factors combined will result in the wood breaking the concrete. By setting the post on top of footing, you’re creating a solid foundation for the deck to stand on.