What is the best door seal for draught exclusion?

For bottom door gaps up to 10mm, a brush seal provides effective draught exclusion while allowing smooth door operation. For gaps up to 20mm, a rubber wiper seal or automatic drop-down seal is more effective. Compression seals are best for door sides and head for gaps up to 15mm.

What is an intumescent door seal?

An intumescent seal contains a material that expands significantly when exposed to heat. On a fire door, intumescent seals expand to fill the gap between door and frame, preventing the passage of hot gases and flames for the door's rated fire resistance period (typically 30 or 60 minutes), as required by UK Building Regulations Approved Document B.

How do I choose the right brush strip pile height?

Pile height should be approximately 1.5x the gap it needs to seal. For a 5mm gap, use 8mm pile. For a 10mm gap, use 15mm pile. Brush pile heights range from 5mm to 25mm.

Can door seals improve acoustic performance?

Yes, acoustic door seals significantly reduce sound transmission through door gaps. Even a 1mm gap allows significant noise leakage. Acoustic seals use compression neoprene or EPDM profiles with automatic bottom seals to close all gaps when the door is shut, achieving Rw reductions of 10-15dB.

What is the difference between a threshold strip and a door bottom seal?

A door bottom seal is attached to the door itself and seals against the floor when closed. Types include brush seals, rubber wiper seals and automatic drop-down seals. A threshold strip is fixed to the floor at the base of the door and covers the joint between flooring materials in the doorway.