How to fill a large gap under old skirting board?

[gravies]

I am trying to insulate a cold room in a 1900s house that has drafts coming up from a cavity beneath. The floors have been stripped and there is large gap under the skirting board that is about 5-8mm high and goes back about 20-50mm.

I want to prevent the air from coming up from the cavity without changing the look. My best guess so far is to put a 25 x 6mm strip of wood in the gap and then seal with decorator sealant. However, it is tricky to get a good seal without making it visible from an angle.

Any thoughts? Shoving paper in there seems far too much of a bodge!

 

[joe-90]

You can get wood coloured sealant in a tube. No-one is ever really going to look that close.

 

[HERTS P&D]

Fill the gap with loft insulation, pushed in with a filler knife. Then do what Joe says, coloured silicone.

Andy

 

[Nige F]

You can get wood coloured sealant in a tube. No-one is ever really going to look that close.

Not heard of a "Hearth Rugger " then Joe T`would be right on eye level for someone

 

[gravies]

Thanks guys, the brown caulk seems to work well, although it looks disgusting on your hands!

Using blue masking tape to protect the floor and skirting makes life a lot easier.