There will be no class on the 13th March. This session will now be added on to the end of the course, the last lecture of the course is now on the 19th June.
I know that this was to be the first session to have one case study completed and to receive feedback. we will cancel that feedback until 27 March when you should have 2 case studies completed
I will post an overview of information that will help you with study for this week.
Dave Pascoe discusses the replacement of leaking windows in an article on his website.
www.yachtsurvey.com/WindowRepair.htm
Aluminum window frames for boats usually have the window sealed into the frame by the manufacturer. The boatbuilder or repairer would normally expect to seal the frame into the window recess. At some point in the boats life the glass itself may need re-sealing into the frame but its more likely with good quality window frames that the aluminium into the recess is the problem. This is the scenario I had imagined for the case study.
Windows are sealed into rebates by the builder or Repairer. What is the most successful method? There are different ideas for the shimming of windows to retain a sealant thickness, I like to use 4mm x 6mm dam rubber which is a rubber tape that has a sticking surface on two sides (the 4mm side) which holds the window away from the surface its being bedded to. This method holds the window 4mm away and allows sealant of that thickness to be applied. The rebate needs to allow the correct depth
Some builders/repairers prefer to remove sealant with a blade when it has cured. the other way is to mask the clean up surfaces, this can also be successful
Take note of the importance of movement, it could be expansion and contraction, or structural
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