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OBC 2006 › Division B

9.25.4.2.

Version 1 — in force 1 January 2010

In force · amended
Verified · covered Verified against the 2010-01-01–2010-03-31 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · continues from 9.25.4.2. — Pro

Base · O. Reg. 350/06 · ext v0 →

O. Reg. 503/09, cl. 181(2) · ext ← current

In force 2010-01-01

OBC 2012 · continues as 9.25.4.2. — Pro

9.25.4.2. — Vapour Barrier Materials

Comparing versions

Changed text stands out · unchanged is dimmed

v0 base

Earlier · 2006-12-31

(1) Vapour barriers shall have a permeance not greater than 60 ng/(Pa∙s∙m2), measured in accordance with ASTM E96, “Water Vapor Transmission of Materials”, using the desiccant method (dry cup).

(2) Where the mild climate indicator, determined in accordance with Sentence 9.25.1.2.(6), is greater than 6300, vapour barriers shall be designed according to Part 5, where,

(a) the intended use of the interior space requires the indoor relative humidity to be maintained above 35% over the heating season and the ventilating and air-conditioning system is designed to maintain that relative humidity, or

(b) the intended use of the interior space results in an average monthly indoor relative humidity above 35% over the heating season and the ventilating and air-conditioning system does not have the capacity to reduce the average monthly relative humidity to 35% or less over that period.

(3) Where the mild climate indicator, determined in accordance with Sentence 9.25.1.2.(6), is less than or equal to 6300, vapour barriers shall be designed according to Part 5, where,

(a) the intended use of the interior space requires the indoor relative humidity to be maintained above 60% over the heating season and the ventilating and air-conditioning system is designed to maintain that relative humidity, or

(b) the intended use of the interior space results in an average monthly indoor relative humidity above 60% over the heating season and the ventilating and air-conditioning system does not have the capacity to reduce the average monthly relative humidity to 60% over that period.

(4) Where polyethylene is installed to serve as the vapour barrier, it shall conform to CAN/CGSB-51.34-M, “Vapour Barrier, Polyethylene Sheet for Use in Building Construction”.

(5) Membrane-type vapour barriers other than polyethylene shall conform to CAN/CGSB-51.33-M, “Vapour Barrier, Sheet, Excluding Polyethylene, for Use in Building Construction”.

(6) Where a coating is applied to gypsum board to function as the vapour barrier, the permeance of the coating shall be determined in accordance with CAN/CGSB-1.501-M, “Method for Permeance of Coated Wallboard”.

v1 O. Reg. 503/09

Later · viewing · 2010-01-01

(1) Except as provided in Sentences (2) and (3), vapour barriers shall have a permeance not greater than 60 ng/(Pa∙s∙m2), measured in accordance with ASTM E96, “Water Vapor Transmission of Materials”, using the desiccant method (dry cup).

(2) Where the mild climate indicator, determined in accordance with Sentence 9.25.1.2.(6), is greater than 6300, vapour barriers shall be designed according to Part 5, where,

(a) the intended use of the interior space requires the indoor relative humidity to be maintained above 35% over the heating season and the ventilating and air-conditioning system is designed to maintain that relative humidity, or

(b) the intended use of the interior space results in an average monthly indoor relative humidity above 35% over the heating season and the ventilating and air-conditioning system does not have the capacity to reduce the average monthly relative humidity to 35% or less over that period.

(3) Where the mild climate indicator, determined in accordance with Sentence 9.25.1.2.(6), is less than or equal to 6300, vapour barriers shall be designed according to Part 5, where,

(a) the intended use of the interior space requires the indoor relative humidity to be maintained above 60% over the heating season and the ventilating and air-conditioning system is designed to maintain that relative humidity, or

(b) the intended use of the interior space results in an average monthly indoor relative humidity above 60% over the heating season and the ventilating and air-conditioning system does not have the capacity to reduce the average monthly relative humidity to 60% or less over that period.

(4) Where polyethylene is installed to serve as the vapour barrier, it shall conform to CAN/CGSB-51.34-M, “Vapour Barrier, Polyethylene Sheet for Use in Building Construction”.

(5) Membrane-type vapour barriers other than polyethylene shall conform to CAN/CGSB-51.33-M, “Vapour Barrier, Sheet, Excluding Polyethylene, for Use in Building Construction”.

(6) Where a coating is applied to gypsum board to function as the vapour barrier, the permeance of the coating shall be determined in accordance with CAN/CGSB-1.501-M, “Method for Permeance of Coated Wallboard”.