Filling Cracked Window Ledge
I have an downstairs outside bay window ledge which is cracking up, as
they do. It's the common thick and deep concrete wrap-around thing which is cast on site. The cracks range from hairline to a couple of mm wide and seem to go right through, although the ledge doesn't seem to be about to fall apart and I want to fix it before it does. Googling this group suggests that PVA as a good filler/glue for cement cracks, but the tin doesn't give any instructions for this application. In fact it only talks about using it as a sealer, but this (UniBond waterproof PVA) was the only "outside use" tin I could find in Homebase. What dilution should I use? Should I add cement to the mix as the tin says? Or will this make it flow less freely? Do I pour it in a bit at a time allowing it to set between pours, or just fill 'em up in one go? Or should I use something else entirely? Previous attempts with outside Polyfilla haven't worked for any length of time. Chris |
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"EricP" wrote
| It may be concrete cancer. If they have iron reinforcing inside | them, it's rusting and causing the cracks. If so, replacement | is the only solution as no matter what you fill with, the rust | is unlikely to stop. In the meantime a temporary way of holding things together might be to drill holes either side of the crack and well clear of it, chisel out a recess/trough linking the two holes, and drop a U shaped steel staple into epoxy into the holes, to hold the two halves together. Then make good over to prevent water/frost ingress. Owain |
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