This makes for a total seal and the foam would flex during temperature changes due to weather conditions. Foam Sealant Joint Backer Rod, non-absorbent compressible grey closed cell polyethene foam backup material. I’ve also started to use spare parts of these foam strips for other DIY repair jobs where two part wood filled had to be supported from the inside of a half-rotten wooden door. During the process, the sealant is pushed against the backer rod and pressed into an hourglass shape, allowing it to stretch properly.

Then apply the silicone bead, keeping the nozzle inside the "crack" - squeeze until the silicone is just proud of the tile face. Quadrant strip never goes black and not visible silicon, it can just simply be wiped down with a cloth. The rod should be inserted into the joint, pushing it down until it reaches the bottom of the joint.Whether you are a professional contractor or a DIY enthusiast, we have the tools and materials you need to achieve a perfect silicone joint every time. You can change your choices at any time by visiting Cookie preferences, as described in the Cookie notice. Tooling also helps protect the weathertightness of the joint by eliminating air pockets created behind the sealant during gunning.

Once the backer rod has been installed, it should be left in place for a few hours to allow it to settle into the joint. setting the correct depth of sealant is a very important part of the sealant process if this is set incorrectly the joints may fail. Foam Sealant Joint Backer Rod – non-absorbent compressible grey closed cell polyethene foam backup material.I bought this to support the application of sealant to gaps between tiling and window frames and for finishing gaps left between flooring and door frames. It is important to avoid over-compressing the backer rod, as this can cause it to lose its shape and affect the performance of the sealant.