I’m about to lay some decking – fairly large deck 4x5m.
I’ve been given about 17 sq m of used decking (3 yr old softwood) which I plan to lay first and then finish off with some matching new planks.
Reading around I’m slightly concerned about shrinkage – the support framework will be new wood, while the used decking has presumably done all the shrinking it will ever do by now. I’m going to have to use a lot of butt joints – at least one on ever strip. Should I be concerned that the support framework will shrink more than the boards and thus leave a gap in my butt-joints?
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"used decking" doesn't conjure up much of an image to me. Boards, sheets thickness.. a few details might generate some thoughtful interest....
It's understandable to have concerns about the potential for differential shrinkage between the used decking and the new support framework. While this can be a valid consideration, there are steps you can take to minimize the risk of gaps forming in the butt joints.
Allow for Acclimatization: Before installation, allow the used decking boards to acclimatize to the outdoor environment for a few days. This can help minimize further changes in moisture content and reduce the likelihood of significant shrinkage after installation.
Proper Installation: Ensure that the support framework is properly constructed and securely fastened to minimize movement. Use pressure-treated lumber or other suitable materials for the framework that are less prone to shrinkage.
Use Spacers: When installing the decking boards, use spacers between the butt joints to maintain consistent spacing and allow for any minor adjustments. This can help compensate for any differential shrinkage and minimize the risk of gaps forming.
Sealing the Ends: Before installation, consider sealing the ends of the decking boards with a suitable outdoor wood sealer or preservative. This can help prevent excessive moisture absorption and reduce the potential for further shrinkage.
Regular Maintenance: Keep an eye on the deck over time and perform regular maintenance as needed. This may include tightening fasteners, replacing any damaged boards, and applying a protective finish to the decking surface to help minimize moisture absorption and further shrinkage.
By taking these precautions and properly planning the installation, you can help minimize the risk of gaps forming in the butt joints and ensure a more stable and visually appealing deck surface.