Morning all

The ceilings are down on my little bungalow renovation and I’m thinking hard about how to re insulate them. I think the electrician would appreciate it if we’re all gone while he’s working from underneath.


Previous posts recommended a fluffy product of some description. I’ve seen this advertised on marketplace local to me for £30 per roll : Rockwool Therma insulation roll 100/200. Any opinions please?

Question is there something similar / less expensive & possibly less itchy out there?

I’m keen to reuse the existing stuff despite it being a horrible job to remove, store and re install. Seems a shame to send it landfill.

Suggestions greatly appreciated

Huw

Posted By: owlmanWhenever I've done awkward between rafters/joists esp. from underneath I've used Rockwool batts, in one form or another. You're able to cut them fairly accurately and hence jam them between the timbers and they stay there unlike the " Fluffy Stuff ".http:///newforum/extensions/Vanillacons/smilies/standard/smile.gif" alt="" title="" >

+1
However fluffy stuff is usually cheaper than batts. If your ceilings are down can you wait with the insulation until the ceilings are back and then put fluffy stuff on top. You are unlikely to get a good enough U value by stuffing either fluff or batts between the rafters, more will be needed over the top (Minimum recommended loft insulation for UK is 270mm)

If you are rewiring then it is better to have any wiring in the loft above the insulation or de-rate the wiring to allow for the insulation (reduce the size of the MCB or increase the diameter of the cable). Your electrician should know about this and best to discuss your insulation plans with them to avoid issues later.

In your position I would put the ceilings back and then put fluff between the joists and more layers over laid so that the joins do not coincide.

Rockwool or equivalent is (much) less of an irritant than glass wool.

edit to say if you are relying on eaves ventilation for the loft don't block the flow with insulation.

Morning

Thanks for the information. It's a it of an odd set up...There's some makeshift rooms in the attic so adding insulation from above isn't mostly feasible.

Appreciate that insulating the floor / ceiling isn't usually enough but the rooms above are plaster boarded and insulated with foam boards of some kind so it's mot just a plain attic. There's two small radiators up there as well which are turned down to almost off and 3 small Velux windows which can be left open a tiny but for air movement.

If i run my hand between the Celotex and the roof there appears to be a gap so I'm hopeful that if I don't stuff the wool too tight to the eaves then there'll be air movement there too.

'll start pricing up Knauf Earth Wool and will have a chat with the electrician about keeping the cables on top or above the insulation.

Appreciate your help!

Don't think I suggested de-rating was not required, though worth pointing out for others reading this. Burying cables usually results in future contractors throwing the insulation about, to find what they are looking for, and rarely replaced, certainly not properly. This forum spends a lot of time discussing the minutiae of thermal improvements, which pale into insignificance, if loft insulation is moved and not replaced. If cables are visible, makes life a lot simpler. It's no more work to clip to rafters than to clip to joists.

I'm still happy we don't have a loft