Good choice very easy to handle sturdy long-term results unknown. Apply the adhesive in short zigzags or waves. Start along the top edge with a thick bead of adhesive and work downwards. We easily trimmed the block verticals to fit cross-pieces between closely-spaced joist "ladders". Hold the plastic up over the wall you want to cover and use a utility knife to cut around extrusion such as windows and pipes. Note that the spacing on the blocks is different in each direction.number 1 is for 1 1/2 inch lumber. Throughout Southern Calif. Span tables say a 2 x 6 can span up to 7 feet seven inches. We spaced the blocks four feet or less apart. Unknown if any of the bases will settle, however it's a pool deck at ground level. At the far end, we had to add a 2 x 6 post a few inches high. We built the rim joist first and leveled from the retaining wall to the rim joist. After trying the joist, a bit of adjusting was required. Most of the joists attached to the wood retaining wall surrounding the pool and the best practice seemed to be establishing the height of the joist based on the retaining wall and height of the pool (we wanted to be just below the pool rim), then placing the first base and leveling each subsequent base therefrom. Ive not seen plastic cinder blocks, but there are other types of plastic edging stones that might work as well. We place 1-3 inches of tamped paver base at each location requiring one-half to one bag of gravel each.
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