Just had loft insulated for 99 pounds. It was worth it, just !
The loft had been boarded between the binders (about half the loft area), t= hen just ceiling joists to the end walls.
So, they fitted 100mm between the joists and 200mm across the joists in the= unfloored area, which is what I'd expect. But in the middle area they only put down 200mm (maybe they assumed there w= as already some under the boarding), although as its slatted, you can see t= here isn't. And the trouble is the scored "earthwool" insulation tends to g= ape easily, so there were lots of gaps, including around any woodwork in th= e loft that was in the way. Very poorly done in the little gable over the b= ay windows. And a gap left around the edges to maintain ventilation was rather enthusia= stic, especially the roof has barely any soffit, no edge ventilation and ti= les without felt. =20 Well, I knew what they were obviously going to do from the rolls the one gu= y asked the other one to bring up, as he asked for far to few rolls of 100m= m stuff, and it sounded like they were short of it (on the first job of the= morning !?). It so happened I had some rolls of 170mm insulation left over= from the extension roof that needed to be used up or thrown away, so I lay= ed this over the middle section and pushed a bit down toward the eves.
At the end I asked him if he had laid the same amount across the whole floo= r and he looked slightly shifty and said yes ! He then seemed surprised that I was paying for the job, so perhaps he went = away feeling a bit like a cowboy. But more likely all the jobs are done in = a slightly slapdash way.
Also, just replacing a rather forlorn bag of insulation stapled to the back= of the loft hatch with some left over celotex !
Simon.