Guide to Icopal Pitched Roof Underlays & BS5534:2014

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

	Zone 1 (wind speeds <22 m/s)
	Zone 2 (wind speeds 22 - 24 m/s)
	Zone 3 (wind speeds 24 - 26 m/s)
	Zone 4 (wind speeds 26 - 28 m/s)
	Zone 5 (wind speeds >28 m/s)

Zone 1: Classifications For Pitched Roof Underlays For Use On Properties In Accordance With BS5534:2014

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:

1. Zonal suitability assumes a well-sealed ceiling as detailed in BS9250.
2. Ridge height is not greater than 15m.
3. Roof Pitch is between 12.5 and 75 degrees.
4. Site Altitude is not greater than 100m.

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Zone 2: Classifications For Pitched Roof Underlays For Use On Properties In Accordance With BS5534:2014

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:

1. Zonal suitability assumes a well-sealed ceiling as detailed in BS9250.
2. Ridge height is not greater than 15m.
3. Roof Pitch is between 12.5 and 75 degrees.
4. Site Altitude is not greater than 100m.

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Zone 3: Classifications For Pitched Roof Underlays For Use On Properties In Accordance With BS5534:2014

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:

1. Zonal suitability assumes a well-sealed ceiling as detailed in BS9250.
2. Ridge height is not greater than 15m.
3. Roof Pitch is between 12.5 and 75 degrees. 
4. Site Altitude is not greater than 100m.
5. Zones 3 & 4 also apply to Northern Ireland 

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Zone 4: Classifications For Pitched Roof Underlays For Use On Properties In Accordance With BS5534:2014

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:

1. Zonal suitability assumes a well-sealed ceiling as detailed in BS9250.
2. Ridge height is not greater than 15m.
3. Roof Pitch is between 12.5 and 75 degrees.
4. Site Altitude is not greater than 100m.
5. Zones 3 & 4 also apply to Northern Ireland 

Back to top

Zone 5: Classifications For Pitched Roof Underlays For Use On Properties In Accordance With BS5534:2014

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:

1. Zonal suitability assumes a well-sealed ceiling as detailed in BS9250.
2. Ridge height is not greater than 15m.
3. Roof Pitch is between 12.5 and 75 degrees.
4. Site Altitude is not greater than 100m.