I am improving a cheapo 1970s flat conversion in an Edwardian terraced house.
The noise of the occupants' footsteps upstairs are very apparent downstairs together with squeaking from ill-fitted floorboards following central-heating installers' sloppy work.
I propose lifting and refitting/repairing the floorboards and filling the floor/ceiling gap with Wickes 30mm heavy density slab insulation (WHDSI), which I have used on the party walls to great effect.
However, the plaster-and-lath ceilings have already shown signs of age-related instability with chunks dropping off, and I'm wondering whether the plaster-and-lath could be made more stable with a lightweight spraying of the NN expanding foam that Screwfix sell. I'm thinking of a good wedge down each joist-to-plaster line, followed by a thick-ish covering of the exposed plaster-and-lath backside.
I have used this foam before, and it cures rigid and seems pretty clingy to any material with which it makes contact.
I'm thinking this cured foam 'cradle' secured to the joists by the foam's adhesive properties could then support some layers of WHDSI as a sound blocker without the fear of compromising the integrity of the ceiling below i.e. not having a collapse on my hands!
Any one who has used spray foam in this regard who can pass on experience of the lateral strength of the cured product, or indeed, who has a related solution to the audio isolation problems posed by old ceilings I would be grateful to hear from you.
The noise of the occupants' footsteps upstairs are very apparent downstairs together with squeaking from ill-fitted floorboards following central-heating installers' sloppy work.
I propose lifting and refitting/repairing the floorboards and filling the floor/ceiling gap with Wickes 30mm heavy density slab insulation (WHDSI), which I have used on the party walls to great effect.
However, the plaster-and-lath ceilings have already shown signs of age-related instability with chunks dropping off, and I'm wondering whether the plaster-and-lath could be made more stable with a lightweight spraying of the NN expanding foam that Screwfix sell. I'm thinking of a good wedge down each joist-to-plaster line, followed by a thick-ish covering of the exposed plaster-and-lath backside.
I have used this foam before, and it cures rigid and seems pretty clingy to any material with which it makes contact.
I'm thinking this cured foam 'cradle' secured to the joists by the foam's adhesive properties could then support some layers of WHDSI as a sound blocker without the fear of compromising the integrity of the ceiling below i.e. not having a collapse on my hands!
Any one who has used spray foam in this regard who can pass on experience of the lateral strength of the cured product, or indeed, who has a related solution to the audio isolation problems posed by old ceilings I would be grateful to hear from you.
