Wooden lagging

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Wooden lagging

Post  Kevster on Fri 28 Dec 2012, 1:26 am

I have made up my wooden strips for lagging and was thinking of putting a coat of varnish to protect them.
Good idea or not?

What have others one?

Thanks

Kev

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Re: Wooden lagging

Post  Tony King on Fri 28 Dec 2012, 2:26 am

Hi Kev,
Given the conditions the lagging lives in, I'd say no to varnish. It'll only act like a glue when it gets warm & possibly "gunge" everything up, also it will cut down the thermal efficiency of the wood as an insulator!! Keep it simple wood be my advice Very Happy
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Tony

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Re: Wooden lagging

Post  Kevster on Fri 28 Dec 2012, 3:33 am

I did wonder about once it got hot it might go a bit soft

What about a wood preservative as used on fencing or sheds?
nothing to go sticky and wont affect the wood much but would give it protection.
Kev

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Re: Wooden lagging

Post  Tony King on Fri 28 Dec 2012, 4:44 am

Depending on the type of preserver you use, it might make the wood more flamable!! Also what are you preserving the wood against?
It's a pretty harsh enviornment in there, wood worm & mould are unlikely to find it palitable Shocked
You can't see it ( Sad ) so visually it's not an issue.
I think leave well alone, maybe cover with Ally foil tape to hold it all in place to give extra heat retension (as discribed somewhere else on the forum, not sure where!!)
Regards,
Tony

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Re: Wooden lagging

Post  the coleman on Fri 28 Dec 2012, 5:00 am

I've completely covered mine in ally tape.Which will hopefully keep out oil & water

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Re: Wooden lagging

Post  Kevster on Fri 28 Dec 2012, 5:18 am

My thinking was that a bit of protection would waterproof it hence prolong its life a bit .

I may well leave it alone

Kev

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Wooden lagging

Post  tractor mike on Fri 28 Dec 2012, 7:16 am

Does anybody no the measurements what the wood should be cut at please

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Re: Wooden lagging

Post  the coleman on Fri 28 Dec 2012, 7:44 am

I cut mine at 12.5 mm wide 8.mm thick. Then cut 64 lengths from smoke Box to front spectacle plate plus fill in pieces.

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Re: Wooden lagging

Post  Kevster on Fri 28 Dec 2012, 7:52 am

I have cut mine about 15mm wide by just under 8 mm thick and cut the lengths to suit.

I have a small air gap between the boiler and wood, this is as thick as I would go, you could quite easily go 1 or 2 mm thinner that way you could have a bigger air gap.

If you measure the cladding rings that will give you the size you have to play with.

hope this helps

Kev

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wood preservatives

Post  Ptolomy on Fri 28 Dec 2012, 1:53 pm

Personally, (and I may be teaching grandma to suck eggs here) I would avoid using any chemical on my engine that was not specifically designed for the environment it will experience. The chemistry of paint is complex and paints are generally specifically designed to perform a particular function and are not designed or suited to others.

As a general rule, paints will do exactly what it says on the tin - if it doesn't say it will, assume it wont. Timber preservatives etc are generally not designed for the sort of environment we are discussing, and may not be suitable. I would seek advice from a paint expert and in particular its stability in this environment (i.e. will it decompose or leach anything over time - and for that matter it's flammablity as has been noted elswhere).

It's also worth remembering the enviroment the lagging timbers are actually in. To rot or char they need oxygen and there wont be much of that when the outer skin is on so the outer skin is in itself a protective mechanism. It may also be worth considering the choice of timber.

Hope that helps.

Happy New Year to all from another one of those Foden 6 inchers.

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Re: Wooden lagging

Post  Kevster on Sat 29 Dec 2012, 1:04 am

Thanks for all the info.

In the light of it all I think I will the wood as it is

Kev

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