I need to plasterboard my loft space, any pointers would be of help.
Best regards.
John
Best regards.
John
It is okay providing you have at least 50mm airflow at the back and roof ridge vent for air circulation. Important otherwise condensation problem.john59 said:I have insulated the roof next to the roofing felt with standard loft insulation(is that ok ? its a tiled sloping roof)
masona said:I have to ask, have you got the correct size floor joists or following building regulation plans ?
I hope you're wrongmildmanneredjanitor said:Can I take a guess?
Best to, the foil backed plasterboard will give a reflecting heat in the summer and maintaining temperature in the winter.john59 said:Am I correct in saying that I should use foil backed boards?
legs-akimbo said:Ordinary rockwool insulation in the rafter space is asking for trouble whether an air gap is left or not, unless you have very good through roof ventillation. Foil backed Kingspan or triple R is the best method, bearing in mind that even conversions with p.p are strictly not allowed the use of mineral wool insulation between rafter as it attracts damp and sweats. Also consider the fact that in the summer the roof covering of your house can reach temperatures of around 60 degrees which would be like sitting in an oven, the double foiled rigid insulation prevents this heat from penetrating, it is excellent stuff. If you have packed the insulation in tight against the underside of the roof then take it out immediately, if you leave it in and plaster over, come the winter and when the central heating warmth meets the cold damp air outside you will know exactly what I mean,,,,left unchecked it willcause untold damage.
I have a room in the roof and insulation on roof rafter with air-flow at back and ceiling joists insulation which you shouldn't do. You either can have roof insulated or floor joists according to building control but I never has any problem so far but having said that it's very well ventilated. In the loft area it's very draughty and you can feel the air blowing in your face, possibly the reason because I lived very near the seafront which is breezy. In all the years in the carpentry I never come across rot condensation problem in roofing but mostly I've done is floor joists rot. I would say the problem start in overheated house with poor ventilation. I never have central heating at 25 C temperature, I have it a lot lower temperature with more clothing on and feel more comfortable and maybe that help as well. Also I think a lot depends on your property location and which way it's facing.oilman said:Is this a case of an automatic panic response to insulation, or does it only present a problem in overheated, underventilated houses?
masona said:The building control are now insisting a minimum 250mm ceiling insulation in new home which doesn't make any heating saving at all, barely noticeable. I wish I has a draughty lead windows and open fireplace, so no problem there
You have two alternatives to insulating between rafters you either leave a 50mm air gap over your insulation and vent it to the outside or you don't and then you must use some sort of vapour barrier between the room and the insulation to prevent moist air entering the space some local authorities will allow foil backed plasterboard some insist on a plastic membrane
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