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Joining cills

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Joining cills

Postby RogerS » 04 Jun 2018, 07:33

Mulling over how best to joint some long lengths of cill to minimise the inevitable shrinkage and subsequent water ingress.

orangerie cill detail.png
(14.62 KiB)


A - simplest. Butt joint. Worst from water ingress. No resistance against lateral movement

B - better. Screws can go through to hold the joint. No resistance against lateral movement

C - best. Screws can go through to hold the joint. Resistance against lateral movement

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Re: Joining cills

Postby Andyp » 04 Jun 2018, 08:39

A wedged scarf perhaps?

Image

I have a scarf joint to do soon but I will be sticking to KISS and doing a half lap.

Image
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Re: Joining cills

Postby RogerS » 04 Jun 2018, 12:23

Elegant, Andy
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Re: Joining cills

Postby Rod » 04 Jun 2018, 15:23

Can’t you get the timber long enough to avoid joining?

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Re: Joining cills

Postby RogerS » 04 Jun 2018, 16:16

Rod wrote:Can’t you get the timber long enough to avoid joining?

Rod


8m ? I don't think so ! :D
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Re: Joining cills

Postby 9fingers » 04 Jun 2018, 17:43

OK so a joint is unavoidable.

I'd go for a timber that is fundamentally rot proof so Iroko for hard wood say or accoya if you are painting.

Dilute., warmed epoxy soaked into the ends. Alignment dowels and a worktop clamp to winch them together with more epoxy. When dry pot the clamp recess in epoxy & filler to keep water out of that.

Or there is always upvc :lol:

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Re: Joining cills

Postby Rod » 04 Jun 2018, 18:48

Is this for The Orangery?

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Re: Joining cills

Postby MJ80 » 05 Jun 2018, 08:29

When I used to do really long cills for sliding doors this is how I did it.
I would do a really long shallow mitre and on the bottom face route in a plywood cleat covering about double the length of the joint and get some screws in through that.
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Re: Joining cills

Postby RogerS » 05 Jun 2018, 11:00

Thanks everyone. Yes, it is for the Orangerie. Just had a price for Accoya :o (£600) It'll be softwood and painted !
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