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Waterproofing precautions for a new house

Waterproofing works best as a coordinated construction system. Good detailing, substrate preparation, slopes, penetrations, testing and protection matter as much as the selected product.

Plan waterproofing for roofs, toilets, balconies, external walls, basements and service penetrations with substrate preparation, detailing, testing and protection checks.

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Identify every water-risk zone before finishing

Roofs, toilets, balconies, utility areas, sunken slabs, retaining/below-grade areas and pipe penetrations need a planned detail rather than a late repair.

Prepare the substrate correctly

Weak, dusty, uneven or contaminated surfaces can undermine many waterproofing systems. Follow the approved system requirements before application.

Detail corners, drains and penetrations

Changes in plane, pipe sleeves, floor traps, parapet junctions and thresholds are common leakage points. Use the project detail and compatible accessories/system components.

Get slopes and drainage right

Waterproofing should not be expected to compensate for standing water caused by poor slopes or blocked drainage. Verify falls before final finishes.

Test before covering the system

Where appropriate for the system and area, carry out the specified pond/flood or water test before tiles/screeds conceal the waterproofing. Document defects and repairs.

Protect completed waterproofing

Subsequent trades can puncture or damage finished layers. Control access and use the specified protective screed/board/detail before continuing.