Decking Joists On Concrete Good
The space between the concrete and the decking material is essential because it allows for air circulation and water drainage to occur thus protecting the capped composite deck boards from the risk of excessive moisture related damage.
Decking joists on concrete. Make sure when using timber outside that the timber is either treated pine or hardwood. Make sure you fall the deck away from the house. Mark out positions for the base plates on the concrete slab see table for minimum span requirements for various width joists these are all based upon continuous span with joists at 450mm between centers.
Use the nail gun to secure the timber between every second joist. This will provide your decking with extra support. Cut 2 by 6 joist blocking by measuring the distance between the joists where they are secured to the support plates at both ends.
We also installed sleepers to support the steps we later added to the concrete stoop. Your deck is now ready to be laid. My proposed deck would be 350 x 370 with height from the slab between 17 18 cm so it stays flush with the brick and same level as my internal floor.
2x4s can not span a very long distance without starting to bend. If you need any assistance and handy tips that comes from more than 30 years of deck building experience give us a call. Editor rich bergman 2x4 joists would be sufficient depending on close they are spaced no further than 12 on center maybe even a bit closer and how long the 2x4s will span from one support beam to the next.
Stops food rings etc falling through. Then cut pieces of timber to this length to fit between every second joist. Cut all the blocks for each space to the same measurement to insure each joist is straight and all the joists in the floor structure maintain alignment.
This distance should be identical at each end. If you want a more complicated decking pattern like the one in this project you ll need doubled sleepers to support any boards that run perpendicular to the others see figure a. I ve been advised that i could use h3 structural timber 140 x 45 as joists and lay decking boards on top that.
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