Soundproofing and insulating a dormer window

Soundproofing and insulating a dormer window
This guide helps you soundproofing and insulating a dormer window to reduce traffic noise and other outdoor ambient noises. You can read about the products to soundproof a dormer window and how to install them. If you have any questions afterwards, just let us know, advice is always free and we’re always happy to help you in any possible way.

Insulating products for a dormer window
Dormer windows are made of lightweight materials, such as wood, which have very poor soundproofing properties. To soundproof a dormer window the walls and ceiling need to be soundproofed with a sound barrier, such as Isomat KE. Mass loaded vinyl sheets add weight to the lightweight construction and thereby soundproofing it against outdoor noise. Products you need for insulating a dormer window:

• Isomat KE 14 - Sound barrier.
• Stauf Extreme Tack - Glue.
• Cotton Wool - Insulation.

How to soundproof and insulate a dormer window
These are the steps on how to soundproof and insulate the dormer window with our acoustic insulation products. Short and quick steps explaining what to do. And as always, just send us an email if you have any questions! 

• Step 1:
  If your dormer has hollow spaces and voids, fill them with Cotton Wool insulation when possible (no opportunity for insulation, start with step 2). This improves thermal insulation and reduces the sound-box effect by absorbing noise. Make sure if there is a need for a vapor foil barrier to avoid condensation. If the insulation wool is in place close up the walls and ceiling with plasterboard or plywood e.g. 
• Step2:
  Use a plasterboard or plywood sheet, 12 mm or thicker, and cut or saw these sheets to the same size and form as the dormer walls and/or ceiling that you want to soundproof. Be precise, because these sheets are the new finished wall or ceiling later on, so they should fit nicely.
• Step 3:
  Take the Isomat KE and cut them in the same shape as the sheets in step 2. Apply a thin layer of Stauf glue on the fiber side of the sheets and apply them to the plywood or plasterboard sheets. The thin layer of glue is to make sure that the layers can’t resonate apart from each other.
• Step 4:
  When the glue is set, about 6 to 8 hours, you can mount the soundproofed plasterboard or plywood sheets to the dormer window or dormer loft with the layer of Isomat facing outwards. So the plywood sheets are facing the room. Use a sufficient amount of screws do mount these heavy soundproofed panels to the dormer! And done!

Now you have added mass to the dormer window walls and ceiling  there should be a fair amount of insulation. If you are still experiencing some outside noises you might want to consider sound insulating windows, a single plain of glass does not insulate that well.

Questions?
Do you have questions regarding this topic? Please feel free to contact us, we will be happy to answer all of your question as soon as possible.