Window reseating

[wooslehunter]

I need to refit a window. The window is in an ali frame & held in with screws & sealant.

The old sealant had't set so it was easy to get the window out. Any idea what it is? I don't want to use anything like sika as this will be hard to remove in the future.

Second question: the screws are double ended. Outside is a normal chrome plated brass machine screw. Inside looks like a screw but actually is internally threaded to take the outside screw. You get a nice neat finish that looks like a screww head from both sides. What are these called & any recommendations on where to get them? Most of them were siezed & broke when I unscrewed them.

 

[sailorman]

I need to refit a window. The window is in an ali frame & held in with screws & sealant.

The old sealant had't set so it was easy to get the window out. Any idea what it is? I don't want to use anything like sika as this will be hard to remove in the future.

Second question: the screws are double ended. Outside is a normal chrome plated brass machine screw. Inside looks like a screw but actually is internally threaded to take the outside screw. You get a nice neat finish that looks like a screww head from both sides. What are these called & any recommendations on where to get them? Most of them were siezed & broke when I unscrewed them.

the fixings are "Interscrews"

 

[Martin_J]

It's likely to be a butyl based sealant.. Check out 'Arbormast BR'

You will find it's half the price of silicone style sealants, does not set, can be removed easily and has something like a 15 year guarantee....

Remember to leave a few mm of thickness rather than tightening down so much that it all gets squeezed out.

 

[Martin_J]

Apologies.. from the datasheet the service life is actually '+20 years'...

Arbormast BR datasheet
http://www.resapol.com/new/datasheets/data959.pdf

 

[Boathook]

It's likely to be a butyl based sealant.. Check out 'Arbormast BR'

You will find it's half the price of silicone style sealants, does not set, can be removed easily and has something like a 15 year guarantee....

Remember to leave a few mm of thickness rather than tightening down so much that it all gets squeezed out.

+1

 

[Tranona]

Expect you will get interscrews from Trafalgar Yacht Services (widely used on Westerlys and other British boats at the time). Will also suggest suitable sealant.

 

[wooslehunter]

Thanks all. Posted the questions a few mins ago. Both now answered.

 

[ianj99]

I need to refit a window. The window is in an ali frame & held in with screws & sealant.

The old sealant had't set so it was easy to get the window out. Any idea what it is? I don't want to use anything like sika as this will be hard to remove in the future.

Second question: the screws are double ended. Outside is a normal chrome plated brass machine screw. Inside looks like a screw but actually is internally threaded to take the outside screw. You get a nice neat finish that looks like a screww head from both sides. What are these called & any recommendations on where to get them? Most of them were siezed & broke when I unscrewed them.

I removed and refurbished the alloy windows on my ketch and used caravan sealant. This does not set, nor form a skin and none of the 3 have leaked a drop since refitting last spring. Its also easily cleaned off using white spirit.
So visit your local caravan centre, not chandlers!

The Interscrews are available from various sources - I managed to get mine out intact.
Ian

 

[rob2]

Yes, caravans are put together with a non-setting mastic and it is available in reels as a strip - very long-lasting. Once replced all the windows in a friend's boat using interscrews and a small number had duff threads, so probably a good idea to round up the number required to allow for duds and those dropped into the bilge!

Rob.

 

[sailorman]

Yes, caravans are put together with a non-setting mastic and it is available in reels as a strip - very long-lasting. Once replced all the windows in a friend's boat using interscrews and a small number had duff threads, so probably a good idea to round up the number required to allow for duds and those dropped into the bilge!

Rob.

older interscrews were brass the new ones s/s

 

[clyst]

I need to refit a window. The window is in an ali frame & held in with screws & sealant.

The old sealant had't set so it was easy to get the window out. Any idea what it is? I don't want to use anything like sika as this will be hard to remove in the future.

Second question: the screws are double ended. Outside is a normal chrome plated brass machine screw. Inside looks like a screw but actually is internally threaded to take the outside screw. You get a nice neat finish that looks like a screww head from both sides. What are these called & any recommendations on where to get them? Most of them were siezed & broke when I unscrewed them.

Most of them were siezed & broke when I unscrewed them.
__________________

Make sure you are sitting down when you get the price of new ones they are hellish expensive.

 

[Deleted member 36384]

Scapa 3507 Bedding Tape

Scapa 3507 Bedding Tape is what I have used on my window refurbishment project. It would be ideal for aluminium frames fixed with inter screws. Once attached the window frame is tightened such that the bedding tape compresses by more than 30%. (picture below of tape on frame)

The good thing about the tape is that it can be attached to the window frame and trimmed to size. Bending the tape round a corner radius is very easy. The only tricky bit is the joint which is cut like a 'Z' on its side. It is easy to cut with a sharp scalpel (picture below of tape join).

If required the window can be removed and resealed using the existing tape. The main point for me is that one knows exactly that the sealant has been added correctly over the whole surface. There is also no excess to dress off.

Worth considering, in my opinion, available from Hadlow Marine here: -

http://hadlo-43547-001.dsvr.co.uk/Pages/seals-bedding.html

One point which you need to consider. I found on some windows that the water was leaking through the frame and not between the frame and coaming, even though the window to frame seal looked OK. So check your windows carefully for this.

Does it work? Hadlow Marine use this tape on their refurbishment jobs, so I guess their reputation depend ends on it. From my own perspective yes, damp areas, that were always damp or collecting water are now bone dry. After the recent storms, which my yacht was side onto most of the time, bone dry, not a weep.

An alternative to liquid sealants which is certainly worthy of consideration. Hope you find this useful.

Interscrews also available from A2A4 at the link below: -

http://www.a2a4.com/acatalog/WINDOW_INTERSCREWS_A_2.html

 

[VicS]

Expect you will get interscrews from Trafalgar Yacht Services (widely used on Westerlys and other British boats at the time). Will also suggest suitable sealant.

The interscrews used on older Westerlys such as the Centaur are a "non- standard" size. ( M3.5 or something silly) Newer boats I believe have a larger and readily available size

AFAIK the ONLY place you will get them is Trafalgar Yacht Services.

They are blooming expensive!

 

[sailorman]

The interscrews used on older Westerlys such as the Centaur are a "non- standard" size. ( M3.5 or something silly) Newer boats I believe have a larger and readily available size

AFAIK the ONLY place you will get them is Trafalgar Yacht Services.

They are blooming expensive!

they might be a BA thread

 

[ianj99]

Interscews

http://uk.rs-online.com

PART NO 425-7553 is an example.

I haven't looked their whole range.

Ian

 

[stav]

I need to rebed one window and refurbish the 6 windows in the aft cabin. Bought some non setting sealant and screws from eagle windows. Seemed helpful but no idea how they compare for price.

No connection and have not even opened the package yet: still sanding and buffing the coachroof......

The screws for my westerly where BA thread.