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Dec 20, 2016
Category: General
Posted by: alvin

The proposed gateway to a planned interoceanic canal shows little sign of activity but locals say Chinese experts have visited recently and work will start soon.

Oct 29, 2016
Category: General
Posted by: alvin

EU and 24 countries sign long-awaited agreement to protect 1.1m sq km of water in Southern Ocean, ensuring that fewer younger fish will be caught

Jul 29, 2016
Category: General
Posted by: alvin
The Utila Ferry War is Over.
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You are here: Home » DIY » Hull & Deck Repair » Rebedding Portlights, Deadlights, and Hatches

Rebedding Portlights, Deadlights, and Hatches

How to Repair Window Leaks

Black aluminum

Black aluminum, anodized or painted, is a problem because aluminum is a great heat conductor, and when they heat up in the sun they expand and break the caulking seal, as well as helping to make the cauking brittle. To stop leaking, you have to use a non-hardening caulking so that the caulking can move with the expansion. To deal with this problem, you have to remove the frames, rebed them and refasten them less tightly than they were previously installed. The reason is that if the frames are drawn very tight, they will squeeze all the caulking out and not allow any movement without breaking the caulking seal. In this case, its best to use a silicone base caulking such as Life Seal or Marine Grade Silicone and use 3/32" shims to prevent the frame from being drawn completely flush, particularly along the top of the frame where most leaks develop. Draw the frame tight against the shim - which is only inserted along the edges - and then let the bedding fully set before pulling the shims out. Once the caulking has fully set - say a week - then go back and retorque the fasteners just a little tighter. What you now have is a gasket against which the frame can be drawn up against.

This method works for all types of windows, including glass sandwiched between two pieces of wood. The trick here is to NOT initially draw the frame completely flush, thereby squeezing all the bedding out. If the frame starts to leak at a later date, you then have the opportunity to tighten it even further, whereas had all the bedding been squeezed out, retightening would have no effect because there's really no gasket in there.