What is the difference between board and hard fiberboard? Is it possible to replace hard fiberboard with 3mm board? It is meant to sit between the air gap and insulation on the upper floor, but the hard fiberboard was out of stock at the store, returning in a couple of weeks...
Hardboard is a type of board. In other words, it's the same name for the same thing, but generally, board is reserved for thicker panels.
And the panel is probably not 3 mm thick but 3.2 mm (1/8 inch, that is).
Possibly the board you were thinking of is thicker and oil-impregnated to withstand moisture and wetness. That is not the thin hardboard.
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Byggaren
And the panel is probably not 3 mm thick but 3.2 mm (1/8 inch, that is).
Possibly the board you were thinking of is thicker and oil-impregnated to withstand moisture and wetness. That is not the thin hardboard.
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Byggaren
but in the description it says hard fiberboard and the girl in the store suggested that the 3.2 mm oil-impregnated board was interchangeable with this one? I have no idea what hard fiberboard looks like. The oil-impregnated board seemed very flexible, is the fiberboard like that too?
3.2 mm hard fiberboard is not oil-impregnated and therefore is less resistant to moisture than an oil-impregnated 3.2 mm board, but I think you are wrong about the thickness of the latter. It is usually not thinner than 4.5 mm. Therefore not replaceable for two reasons.fialottabus said:
1. It is more moisture resistant.
2. It is quite a bit stiffer and does not buckle. Therefore, it can be nailed with a batten parallel to the rafters in each section and a batten in the middle. 3.2 mm hard fiberboard buckles quite significantly and therefore requires a couple of spacer battens in the middle of each section to not eventually lean against the outer roof panel = poorer air gap.
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Byggaren
Thanks!
So nice that it's not worse with the oil-impregnated board - according to the house manufacturer's instructions for insulation of the upper floor, it should be a 3.2 mm hard fiberboard. But won't this bulge inward and compress the insulation???
So nice that it's not worse with the oil-impregnated board - according to the house manufacturer's instructions for insulation of the upper floor, it should be a 3.2 mm hard fiberboard. But won't this bulge inward and compress the insulation???
Not if you nail it as I wrote, with battens along the rafters and two battens in the middle cc 40 cm, nailed to the sub-roof/watertight roof panel.fialottabus said:
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The Builder
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