Insulating under ground floor

[Smythe]

I want to have bare floorboards on the ground floor, and was therefore going to insulate under the floorboards.

Do you think it would be possible to simply lift one floorboard at each of the room and pull insulation along under the boards using, perhaps, string attached to one end?

That is, rather than having to lift every floorboard?

Would you suggest any particular type of insulation to use?

Thanks for any info!

 

[Branz]

I want to have bare floorboards on the ground floor, and was therefore going to insulate under the floorboards.

Do you think it would be possible to simply lift one floorboard at each of the room and pull insulation along under the boards using, perhaps, string attached to one end?

That is, rather than having to lift every floorboard?

Would you suggest any particular type of insulation to use?

Thanks for any info!

No!
What depth are the joists?

There are a number of ways of doing this but all need the floorboard lifted.

Whatever way you chose to do it, you need to make sure that no air can get in/pass through at the ends between the insulation and the underside of the floor boards

 

[Smythe]

No!

Why not?

What depth are the joists?

I would have to check this?

you need to make sure that no air can get in/pass through at the ends between the insulation and the underside of the floor boards

So the insulation should be up tight against the underside of the boards?

So if the joists were deeper than the depth of the insulation, presumably something would be required to hold the insulation up tight against the underside of the floorboards.

 

[Branz]

the usual way to do this is to fill the space between the joists with insulation, supported in some way.
Some folk use chicken wire clipped to the underside of the joists to support glass fibre or sheeps wool
some folks nail cleats on each face of the joists and cut rigid poly type insulation to suit and fill any gaps with expanded foam
or natural wood fibre insulation.
Some others put ply of chip on the cleats and spray foam and then cut it level with top of joists, or fill with loose insulation
Others just go to pub

The joist depth will determine what you can use, u may find that u cannot meet the spec for floors but whatever u do would be a +, as long as it is done right.
It it is not done right dont waste your time

No re the tight.
the joists will end close to the wall at each end and any gap here can be sealed with tape or expanded foam.
The key to insulation is to eliminate unwanted/uncontrolled ventilation around it because it is the air movement that carries away most of the heat

 

[Smythe]

Thanks for this info. I'll try and do some reading up on this subject.

The joist depth will determine what you can use, u may find that u cannot meet the spec for floors but whatever u do would be a +

What is the spec for floors? I'm not sure what this means.

No re the tight.

I'm not sure what this means.

the joists will end close to the wall at each end and any gap here can be sealed with tape or expanded foam.

Any particular type of tape?