Breather Membranes - Zonal classifications for pitched roof underlays for use on properties with in accordance with BS5534:2014
For – : No Ceiling Or No Well-Sealed Ceiling And A Dominant Opening, Minimum wind uplift requirement = 2350 N/m²
Choose the appropriate zone for your project from the map and then click on the zone links below
For – : No ceiling or no well-sealed ceiling and a dominant opening, Minimum wind uplift requirement = 2350 N/m²
Product Reference Tables – LR (Breather Type) Membranes
Table Key
" ■ " Indicates product complies without taped overlap.
"Tape" Indicates product complies with a taped overlap using Icopal double sided lap jointing tape.
Important Notes:
- Zonal suitability assumes a well-sealed ceiling as detailed in BS9250.
- Ridge height is not greater than 15m.
- Roof Pitch is between 12.5 and 75 degrees.
- Site Altitude is not greater than 100m.
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For – : No ceiling or no well-sealed ceiling and a dominant opening, Minimum wind uplift requirement = 2350 N/m²
Product Reference Tables – LR (Breather Type) Membranes
Table Key
" ■ " Indicates product complies without taped overlap.
"Tape" Indicates product complies with a taped overlap using Icopal double sided lap jointing tape.
Important Notes:
- Zonal suitability assumes a well-sealed ceiling as detailed in BS9250.
- Ridge height is not greater than 15m.
- Roof Pitch is between 12.5 and 75 degrees.
- Site Altitude is not greater than 100m.
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For – : No ceiling or no well-sealed ceiling and a dominant opening, Minimum wind uplift requirement = 2350 N/m²
Product Reference Tables – LR (Breather Type) Membranes
Table Key
" ■ " Indicates product complies without taped overlap.
"Tape" Indicates product complies with a taped overlap using Icopal double sided lap jointing tape.
Important Notes:
- Zonal suitability assumes a well-sealed ceiling as detailed in BS9250.
- Ridge height is not greater than 15m.
- Roof Pitch is between 12.5 and 75 degrees.
- Site Altitude is not greater than 100m.
- Zones 3 & 4 also apply to Northern Ireland
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For – : No ceiling or no well-sealed ceiling and a dominant opening, Minimum wind uplift requirement = 2350 N/m²
Product Reference Tables – LR (Breather Type) Membranes
Table Key
" ■ " Indicates product complies without taped overlap.
"Tape" Indicates product complies with a taped overlap using Icopal double sided lap jointing tape.
Important Notes:
- Zonal suitability assumes a well-sealed ceiling as detailed in BS9250.
- Ridge height is not greater than 15m.
- Roof Pitch is between 12.5 and 75 degrees.
- Site Altitude is not greater than 100m.
- Zones 3 & 4 also apply to Northern Ireland
Back to top

For – : No ceiling or no well-sealed ceiling and a dominant opening, Minimum wind uplift requirement = 2350 N/m²
Product Reference Tables – LR (Breather Type) Membranes
Table Key
" ■ " Indicates product complies without taped overlap.
"Tape" Indicates product complies with a taped overlap using Icopal double sided lap jointing tape.
Important Notes:
- Zonal suitability assumes a well-sealed ceiling as detailed in BS9250.
- Ridge height is not greater than 15m.
- Roof Pitch is between 12.5 and 75 degrees.
- Site Altitude is not greater than 100m.