How do I go about this Loft RE Insulation

[cameron1590]

Hi Guys,

Wll we were on a goverment grant to get this done but they pulled the funding and canceld on us

So seen as I have spent all the time lifting the boards Im going to insulate it myself.

I have one problem thought, our loft seems to have additional raised joists?
I understand how you lay insulation normally 100m between the joist and then 150mm 90 degrees over the top but these large additional joist are 280mm deep & 270mm width So how do I go about this ?

Do I run 100mm in between them and the 150mm over the top essentially there would be a pocket between them or do I have to build the first layer too 280mm or more then run some over the top? Leaving no pockets ?

Please see pics below:









Any advice would be much appreciated !

Cameron

 

[cameron1590]

Bump, Anyone ?

 

[freddiemercurystwin]

The regulars can be really lazy sometimes on this free forum.

 

[kbdiy]

Simple answer is - put as much as you can wherever you can. Don't be afraid to go thicker than 100+150. The minimum recommended and required in new builds is now 270mm but insulation is relatively cheap so throw as much down as you can.
My loft is 100mm base layer with 2 x 170mm top-up layers running criss-cross. Just be careful to ensure you still have good airflow from the eaves over the top of the insulation otherwise you are likely to get condensation issues.