# Building Regulations (Northern Ireland) 2000, Regulation B4: Urea formaldehyde foam

Extent: N.I.
Status: prospective

(1) Subject to paragraph (2), in-situ foamed urea formaldehyde shall not be used in the erection, structural alteration or extension of a building.
(2) In-situ foamed urea formaldehyde may be used for filling the cavity of a cavity wall having an inner leaf constructed of bricks or blocks,provided that it is—
(a) suitable for such an application; and
(b) satisfactorily installed.

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Source: https://www.legislation.gov.uk/nisr/2000/389/regulation/B4 (the official version)
Page: https://openlegislation.uk/building-regulations-northern-ireland-2000/regulation-B4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.