by Oddbod »
Thu Nov 08, 2007 9:45 pm
Hi. Wood is a lovely material, but as you have found it does move with changes in humidity. Where the movement is small some of the exterior paints have enough flexibility to cope. Where the movement is significant the only real way is to use an appropriately coloured frame sealant – the stuff they put around window frames.
The problem could have been minimised during construction, but I doubt you'd want to rip the sill out now to do so!