Party Wall Insulation

When two properties share a wall, sound has a sneaky way of slipping through. Party wall insulation is the insulating material added between studs or into a cavity within a shared wall construction to improve soundproofing, energy efficiency and fire safety.

It makes the wall denser and quieter, and the space more comfortable for both neighbours.

What Is Party Wall Sound Insulation?

Party wall sound insulation is a way of improving the acoustic performance of a shared wall. It is the material added between the timber studs or inside the cavity of a dividing wall, to limit noise transmission, which could be in the form of footsteps, laughter, TVs, or music.

This acoustic infill ensures privacy on each side by absorbing sound waves and reducing vibration through the wall. Although it significantly reduces noise, it does not eliminate noise transfer, making everyday living a lot more comfortable on either side of the wall.

What Is A Soundproof Party Wall Used For?

A soundproof party wall is installed to help two homes share a boundary without sharing every sound that happens inside. They are used anywhere two homes, flats, or apartments share a wall:

• Between semi-detached houses
• Between terraced homes
• In adjoining flats
• In home extensions built against a neighbour’s property boundary.

Benefits Of Soundproofing A Party Wall

Here are some benefits of soundproofing with party wall noise insulation:

• Limits noise – voices, music, footsteps, the clatter of everyday life.
• Adds privacy, where containing even small sounds gives people a real sense of personal space.
• Reduces vibration and echo – living areas become more comfortable and relaxing.
• Some soundproofing products also offer modest thermal benefits.
• In the case of acoustic slabs, you get extra rigidity, making walls more solid and resilient.

FAQ

Where to buy party wall insulation?

You can purchase party wall insulation online at Insulation Wholesale. We offer options like the Superglass 75 mm or 100mm rolls, and the 100mm URSA party wall roll. Orders are straightforward, and we usually hold UK stock, so you can expect competitive prices and fast nationwide delivery.

Which party wall insulation to buy?

If working on a party wall where noise is the main issue, go for the 100mm URSA Party Wall Roll for its density and acoustic absorption.

If it is a more balanced job – for heat and sound control – the 100mm Superglass is a solid all-rounder.

If space is tight or you want something cost-efficient but effective, the 75mm Superglass is a clever pick – easy to install, less waste, and still delivers.

How thick party wall insulation should be?

Select a thickness based on the wall build-up, building regulations, and how much sound or heat you want to block.

• 75 mm to 100mm is usually recommended for shared walls.
• For smaller cavities or minor upgrades, 75 mm works well and is easier to fit.
• Go closer to 100mm or choose a denser product in semi-detached houses or flats where noise is a big problem.

The key is to match the insulation thickness to the available space and desired performance.

How much is party wall insulation?

The cost of party wall acoustic insulation depends on the type, thickness, and brand. On average, glass or mineral wool rolls like Superglass or URSA cost roughly £10–£25 per roll for 75–100mm thickness. Thicker or denser slabs designed specifically for acoustic performance can be more expensive – around £30–£50 per slab.

Remember to allow extra material for cutting and fitting, but overall, these rolls and slabs are affordable and deliver noticeable sound reduction while remaining cost-effective.