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Waterproofing of doorway jambs and architraves
- Materials exposed to prolonged moisture should be resilient:
In areas with potential contact with moisture, use a resilient material like a kiln-dried hardwood, or treated pine equivalent. Open grained or compressed fibre timber should be avoided. In the event moisture travels under the finished floor surface, the jamb or architrave may swell and degrade timber or membranes leading to costly repair. - Determine which compliance pathway you are going to follow:
Regulatory pathways can affect jamb and arc installation methods, materials and scheduling of waterproofing. - Always pre-paint the entire architrave:
Sealing with appropriate primer on all faces of an architrave and jamb, particularly the end-grain, will reduce the potential for moisture to be absorbed.
Architraves at flashings, junctions and waterstops
Under Part H4D2 and H4D3 of NCC 2022 Volume Two, there are two Deemed to Satisfy pathways that can be followed: the ABCB Housing Provisions or Australian Standard AS 3740. While both are acceptable, they have slightly different details for jamb and architrave installation.
The ABCB Housing Provisions Standard
Figure 10.2.24 (a) of NCC Volume Two shows the architrave installed before the installation of the perimeter flashing, waterstop and tiles - therefore requiring the perimeter flashing to extend around the architrave and door jamb to the waterstop. The wording in the clause would require the height of the perimeter flashing and waterproofing to finish 25 mm above the tiles.
Australian Standard AS 3740: 2021
AS 3740 has similar provisions for the height of the perimeter flashing (25 mm), also requiring waterstops across the opening. The membrane must create a waterproof seal to the waterstop and perimeter flashing.
The difference is under clause 4.9.2 protection of door frames and architraves states that timber door frames and architraves must not be embedded into the tiles. The architrave must have a minimum of 2 mm gap between the architrave and the floor and the underside of the door jamb and architrave must be treated to resist moisture.
Figure 4.9 below shows a rebate in the door jamb and the waterproof membrane applied to the waterstop and perimeter flashing with the architrave 2 mm above the proposed finished floor surface.
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