A casement window comes in two basic options, either a storm sash or flush sash. The storm sash is the type normally fitted in most houses from sometime around the 1950’s. This window design was developed, as the name would suggest, to provide storm proofing by overlapping the outside sash (opener) onto the window frame which helped avoid rain and wind ingress. Prior to this most windows had a flush sash which was much less efficient in terms of weather proofing. Recent developments in PVC-u window systems has seen the reintroduction of the sash window using modern materials and manufacturing techniques which not only produces a flush sash window which performs well in all weathers but aesthetically replicates traditional styles. Whilst PVC-u windows in the past were all very similar in terms of aesthetics and quality, the manufacturing techniques now used to produce some storm and flush sash windows means the quality and aesthetics can vary dramatically. Some systems are still mass produced with welded corners, transoms and mullions where others are virtually fully hand made much the same way a carpenter would have done in days gone by. You can see a full range of both styles on display at our new Alresford showroom just outside Colchester.