It is important to keep that 300mm space where the insulation is.Īlso, a vapour barrier would be needed just under the boards (loft boards) so, if and when condensation happens, it doesn’t come through the boards and creates wet/damp patches. If the loft legs are not to the required height, then an extension on the joists is a must then proceed with the rest. Just make sure you are above the (300mm) insulation When it comes to boarding up, there are loft legs you can buy and fix them up to the original joists then board over. Please make sure that the insulation has nothing resting on top, as it’ll loose the insulating properties and may also cause condensation. So, remove the old insulation and add 100mm base layer (parallel with the joists) then 200 super top up (lay across) would bring you just above the recommended guideline. The recommended loft insulation thickness currently stands at 275mm Right, let’s get the facts right and clear here: I hope this helps and good luck with your project. If they don't have any damage you will be all good. Also use screws instead of nails to avoid vibration and check to see if the ceilings have any damage. It would take you to either 225 or 250mm which would give you inbetween the recommended thickness of loft insulation in the UK. In either of the above cases you can add some 150mm timber then add 150mm loft insulation. It's recommended to have between 200 and 300mm of insulation in the loft so if you're installing floor boards you will also need to add another level to the existing joists running in the other direction in a criss cross. If you do it correctly then no weight or pressure will be applied to the ceiling plasterboard. Some older properties might have different size joists so you just need to check first. If it's 75mm joists then buy 75mm thick loft insulation. Remove all the old insulation and then purchase some 100mm loft insulation role. Your loft joists will most likely be 100mm.
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