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Old 02-05-2018, 11:07 AM   #11
Flashbang
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Brown? Representing earth colour!
I would coat the surface first with dilute PVA glue mixed 65% glue to 35% water and brushed on then allowed to dry for at least 24 hours. This will seal the fibre insulation board and stop any emulsion paint soaking in too much.

TBH Insulation board is not an ideal choice for a baseboard. It is worse than Sundeala board if not supported underneath ideally on 6mm ply etc.
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Old 02-05-2018, 12:57 PM   #12
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I've built my layout using insulation board, you might want to take a look at the photos on my blog (see signature link). I used 50/50 PVA and water all over to seal it, I think in two coats. Then I used acrylic paint on top of that, starting with brown and then going over with green (for grassy areas) or black (for roads). Looks really good so far. The green will eventually have scatter grass glued on top, and the track bed will at some point be ballasted.

So I'd definitely recommend that insulation board. It's easy to work with, and has a nice natural texture to it. It's not strong though, so you'd definitely need a supporting wooden structure underneath.
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Old 02-05-2018, 03:12 PM   #13
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So your layout is actually on chipboard or ply with a layer of insulation board on top.
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Old 02-05-2018, 04:34 PM   #14
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Main problem with insulation board, and the reason it is not recommended, is because it is unstable if it get damp and prone to go out of shape eventually.
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Old 02-05-2018, 06:18 PM   #15
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I've been told that a number people from model railway clubs use insulation board.
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Old 02-05-2018, 06:23 PM   #16
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Quote:
Originally Posted by Squad View Post
I've been told that a number people from model railway clubs use insulation board.
That probably stems from some ancient advice from Peco - did they have shares in Sundeala?
It can be used successfully but needs significantly more support and bracing to keep it totally flat. If it does warp or sag it will adversely affect the track and will cause problems with your locos and stock.
IMHO itís best avoided.
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Old 02-05-2018, 06:34 PM   #17
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No, they insulation board instead of Sunbeala and the club's are in the Blackpool area. I think they used it because it is cheaper than Sundeala
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Old 02-05-2018, 06:37 PM   #18
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Iím pretty sure it must be glued and screwed to a very strong frame. Just because a club uses it doesnít mean it is a good idea. There is a very clever chap on youtube with an amazing layout who had to rip up part because of warping. Iím not saying he was using insulating board but just saying even experts make mistakes. Ply is a far better choice.
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Old 02-05-2018, 07:36 PM   #19
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Maybe for you, but each to his own.
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Old 02-05-2018, 08:40 PM   #20
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I couldnít agree more.
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