Hi All,
I would like to know what materials will help reduce road noise in my garden home office currently under construction.
The office is about 100ft away from a busy motorway and was previously a timber framed lean to pergola with a 16mm triple wall poly-carbonate roof converted to an office. The office has 2 external walls and I guess these together the roof are where motorway sound is coming from.
The construction started by adding 2x4 timber studs to the existing pergola, then ½ inch OSB was screwed to the outside. The stud work was filled in with 75mm of PIR foil faced insulation and sealed with foam around the edges.
A breathable membrane was added to the outside of the OSB and a PVC dpm used over the stud-work internally and on the floor.
The floor consists of the existing concrete base with 75mm EPS foam added, then 18mm t & g chipboard.
Next we added ½ inch acoustic plasterboard to all the walls screwed on to the studs. A upvc French Door was fitted and the plan is to add tongue and groove log lap cladding to the exterior.
Currently the noise reduction is not sufficient and I don't know how much the log lap cladding will help when added. The log lap will be laid on battens to allow air flow.
Does anyone have ideas for improving sound insulation from the motorway? Some of my thoughts are as follows:-
Thoughts and comments welcome.
I would like to know what materials will help reduce road noise in my garden home office currently under construction.
The office is about 100ft away from a busy motorway and was previously a timber framed lean to pergola with a 16mm triple wall poly-carbonate roof converted to an office. The office has 2 external walls and I guess these together the roof are where motorway sound is coming from.
The construction started by adding 2x4 timber studs to the existing pergola, then ½ inch OSB was screwed to the outside. The stud work was filled in with 75mm of PIR foil faced insulation and sealed with foam around the edges.
A breathable membrane was added to the outside of the OSB and a PVC dpm used over the stud-work internally and on the floor.
The floor consists of the existing concrete base with 75mm EPS foam added, then 18mm t & g chipboard.
Next we added ½ inch acoustic plasterboard to all the walls screwed on to the studs. A upvc French Door was fitted and the plan is to add tongue and groove log lap cladding to the exterior.
Currently the noise reduction is not sufficient and I don't know how much the log lap cladding will help when added. The log lap will be laid on battens to allow air flow.
Does anyone have ideas for improving sound insulation from the motorway? Some of my thoughts are as follows:-
- add a second later of acoustic plasterboard with a 2mm rubber sheet in between. I've read that this works really well. Do all 4 walls need this treatment or just the 2 exterior walls?
- add a layer of 12mm OSB on the exterior battens before adding the log lap cladding. Perhaps a layer of 2mm rubber could be sandwiched between the OSB and cladding?
- Regarding the triple wall poly-carbonate roof, I can only think of infilling the space between some of the rafters with rockwool sound insulation and then adding acoustic plasterboard as a ceiling. Currently all of the ceiling is poly-carbonate so may have to add sound insulation to an area around the edges (30% ?), so some light will be lost.
Thoughts and comments welcome.