Cantilevered log decks are a potential area for problems with rotten logs. We run into this type of deck a number of times each year. A cantilever deck is a deck that is supported by a log that sticks through a wall (on the outside) and supports a deck. These decks are usually located on the second floor of a log home and most times are small in size.
The problem is that most of the time, they are constructed with pine logs that are designed or allowed to stick right out beyond the roof line where they are exposed to the weather. They take on so much moisture that they become susceptible to rot. When these logs begin to rot, it often happens very fast.
This one was built right. Notice the drip edging around the perimeter. These logs underneath see very little water. Built to last.
In our assessment, there are basically three options for the home owner:
1) The deck can be removed. This is an option but leaves you with the problem of what to do with a “door to nowhere”
2) The length of the extending logs can be shortened enough to get them inside the drip line. This means cutting them back typically between 12″ and 24″, which eliminates the rotted portion of log. Usually with this option, the railings can be modified and used again.
3) Convert the deck into a roof. To do this, we take off the railings and decking, make a new platform and create a flat roof.
Here are some related links that may be of interest:
Replacing rotten logs
Replacing perlins
Borate as a preservative
One thing we often come across are rotten logs along a deck that has been connected to a house. The logs that the deck is attached to are in a particularly vulnerable place and therefore, need to be watched for signs of rot.