DIY Doctor

Retrospective Soundproofing of a Loft Conversion Near Busy Road

Postby toadley » Wed Sep 09, 2015 3:04 pm

I'm hoping sombody may have been in a similar situation and can offer any advice.

Our main bedroom is in a loft conversion, situated by a fairly busy road. On the road facing side, the ceiling angles down at around 30-40 degrees to horizontal (following the roof) until around 1m high where there's an internal stud wall and eaves storage behind.

There are also 4 velux windows on that pitched roof.

Currently the roof and the back of the dwarf wall have kingspan type insulation although there are a few gaps and it looks like a pretty scrappy effort from the guys who did the conversion originally and the internal stud wall just appears to be one sheet of standard plasterboard.

As you can guess- we hear a lot of road noise!

I've got the more soundproofed upgrade kits on order for the windows which will improve that aspect but I'm unsure what to do regarding the wall.

I've been quoted on a resilient bar/12.5mm acoustic board/19mm acoistic board/acoustic mineral wool combo which will eat up some much needed space or I could just do acoustic mineral wool with one layer of acoustic plasterboard to keep the space and hopefully once the other little gaps are plugged it will be good enough.

Anybody had experience with loft conversions / trying to reduce traffic noise? Is there even an easy way to tell what's airborne and what is coming through the building?

Any help greatly appreciated!
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Simply Build It

Postby thedoctor » Wed Sep 30, 2015 1:41 pm


This is a bit of a tricky one and may be worth contacting someone who specialises in soundproofing as it’s not necessarily down to the volume of soundproofing used (although this is essential) but also what items and materials are allowing sound to travel through them, this may also be a key factor.

In light of this it may be worth checking out our sound proofing in the home project: ... e_home.htm and also contacting Custom Audio Solutions as they are experts in this field for some further help and advice

Kind Regards
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