insulated slab and pumped cavity..???

delta1980

brother renovating a 70's bungalow, he was thinking of pumping the cavity and also fixing an insulated plaster board slab on the inside of the external walls. if this was done would it be ok or present any problems??. there are no services on the external walls as the house is being replumbed and rewired

BryanF

delta1980 wrote: »

renovating a 70's bungalow,
pumping the cavity and also fixing an insulated plaster board slab
would it be ok or present any problems??.

there lost of postings on this on the forum. id be looking at where and how frequent the thermal bridges are, the condition of the wall finish, its air-tightness at junctions, the thickness of cavity and whether it varies etc before determining the beat insulation method. there is a risk of mould caused by condensation from on the inner wall ie due point - however there is a rough rule of thumb (I don't have a link to any science on this btw) that suggests the internal dry-lining 'insulation value' should not be more than 1/3 of the overall 'insulation value'. so if the cavity is 100mm pumped with *beads the dryling would be no more than 32mm *EPS insulated plasterboard. (*0.044 w/m2k)

delta1980 wrote: »

e
no services on the external walls

• how are you dealing with fixing kitchen, curtains or other items
• revels around the windows, are they being changed? if so is it a good time to get the insulation continuity details right correct
• same for air-tightness(AT), while your renovating should you set an AT target? its not so bad when everything is paired back..
• i assume you installing/retaining 'hole in wall' vents in each room (mech in kitchen & wc) OR are you looking at the AT and considering a more complex system.. extra insulation is a waste if you dont ventilate right

delta1980

the internal walls are stud partition so he was thinking if removing/ cutting back the partition at the point of contact with the external wall. he would then be able to get the insulated board all around the internal surface. didn't think about the kitchen units. would an insulated board followed by a sheet of plywood be a solution to this for the kitchen?? as for curtains would it be ok to cut out a piece of insulated plaster board, insert a piece of timber and fix the carrier for the curtain pole to this??. is there any publication available that would deal with these type of details so we can do it correctly??

delta1980

the current windows are being kept, so I think that we could only be able to do the reveals on the inside which obviously would be quite thin. as fro ventilation we would keep the exsisting vents

maarto

delta1980 wrote: »

brother renovating a 70's bungalow, he was thinking of pumping the cavity and also fixing an insulated plaster board slab on the inside of the external walls. if this was done would it be ok or present any problems??. there are no services on the external walls as the house is being replumbed and rewired

I would just use the insulated board . I have done this on 100's of houses already . Never had any complaints . And everyone says it makes a massive difference . Anybody who gets the walls pumped say " I think it made a difference " or " not really sure " where as the insulated board always does the trick !

archtech

maarto wrote: »

I would just use the insulated board . I have done this on 100's of houses already . Never had any complaints . And everyone says it makes a massive difference . Anybody who gets the walls pumped say " I think it made a difference " or " not really sure " where as the insulated board always does the trick !

And for many years loads of building used asbestos with no complaints nor was anybody was aware of the side effects. Insulated plasterboard used in the wrong circumstances is potentially the next asbestos, engage the services of a professional to undertaken analysis of the particular situation.

maarto

archtech wrote: »

And for many years loads of building used asbestos with no complaints nor was anybody was aware of the side effects. Insulated plasterboard used in the wrong circumstances is potentially the next asbestos, engage the services of a professional to undertaken analysis of the particular situation.

What are the wrong circumstances ?

sydthebeat

maarto wrote: »

What are the wrong circumstances ?

Where fungus and mould can build up over time. ...