I've installed a new patio door which has wider threshold and now it bends a little when I step on it since it has no support underneath. Any ideas hot to cover that area and add support so it looks professionally done?
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It looks like it only overhangs 3/4".
Add a 1x3 or 1x4 trim board made of PVC.
Construction adhesive and a few evenly space tapcon screws should do it. Then caulk any seams with polyurethane caulk.
RMDman
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