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PostPosted: Sun Sep 23, 2018 10:45 am 
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Hi,

New here. We are having a loft conversion done and company has failed time and again to waterproof the roof, so we are now experiencing the 4th rain leak in 5 weeks.

As a result, one of the chipboard roof panels (where it leaked every single time) has been soaked through and through, and I am concerned about its integrity. Should we ask for it to be replaced?

Second issue, the MDF staircase. Despite our best efforts with buckets and boxes several steps have also been soaked repeatedly. What's the risk with these? Certainly the company will say it's OK, as it would cost them a fortune to replace the staircase but is it really OK?

Any advice much appreciated, as we are extremely angry and concerned.


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PostPosted: Sun Sep 23, 2018 11:01 am 
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If either chipboard or MDF has swollen due to moisture, they will never return to their original state.

I'm not sure why you would have chipboard roof panels, but good quality modern chipboard flooring will withstand considerable amounts of direct rain before becoming useless, we've often laid floors on new builds just to give us something to stand on to do the roof , these have got wet without any problems, but in general terms, older chipboard or anything but MR MDF (which is green in colour) will need replacing.

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PostPosted: Sun Sep 23, 2018 11:07 am 
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Thanks. I did wonder the same when I saw them. The whole external structure is made of chipboard. I guess they had to cut corners so as to - on paper - price match another quote. Stairs are not swollen yet and now laid tarpaulin allover. Can't say the chipboard. Apart from swelling, is there any risk of it 'crumbling' at any point in the future?


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PostPosted: Sun Sep 23, 2018 11:19 am 
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Even MR chip is likely to break down if subjected to enough water or water is trapped above/below it (we had a weeping leadloc in the kitchen and had to take up a section of floor )

I haven't seen chip used in roofing since the late 90's apart from sheds and rabbit hutches - wbp or sterling board is the way to go

imho it needs to be inspected and repaired or replaced


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PostPosted: Sun Sep 23, 2018 11:25 am 
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Remember MR MDF is only 'moisture resistant' not waterproof. I used to work in the lab where they made the stuff.

I'd be aghast if they used chipboard as roof panels.

Did the builders wear stetsons and six guns? More importantly have you paid them?


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PostPosted: Sun Sep 23, 2018 11:32 am 
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Apologies, it is actually sterling board. My bad, had not come across that and assumed it was just a type of chipboard. Does this mean it will still be OK despite the constant soaking?


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PostPosted: Sun Sep 23, 2018 11:40 am 
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P.s. Thanks Bob for mentioning sterling board. I was working myself up even more than I was already for the umpteenth leak :angryfire: :lol:


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PostPosted: Sun Sep 23, 2018 9:58 pm 
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Exterior OSB sheathing is made using water resistant glues and will stand up to a few showers with little harm - but it won't really stand up to repeated soakings. It is normal to store it off the ground, sheeted over and to overclad it soon after installation. Other reasons for its' use (over exterior grade plywood) is that it is a more efficient use of wood fibres (so reduced CO2 footprint - essential on a lot of jobs these days) and it is actually stronger than plywood with far greater shear resistance. Where it falls down is that nail holding is nowhere nowhere near as good

From experience P5 (MR) shipboard flooring can take a fair bit of abuse (soakings) after installation, but that's only really after it has been installed (stacked, soaked then installed it can be a nightmare). On the other hand MDF stairs, even MR-MDF ones, really need to be installed after the building is weathertight as it really won't stand up to much abuse. And soaking it is abuse

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