Waterproofing materials

Waterproofing materials by type

Each page in this section deals with one material or one job. The right-hand column gives one figure from the data sheets that page relies on.

Waterproofing materials by type

Material	What the page answers	One figure from its sources
K11 waterproof coating	how a two-part polymer cement slurry is mixed, how much is needed per m², which surfaces it suits	JUYONS: about 1.5 kg/m² per mm of film, 2–3 coats
Waterproof cement	what is sold as waterproof cement and where it goes	Palace Intrapruf: 4.5 L of admixture per 150 L of gauging water
Bitumen paint	what bitumen paint is, its kinds and where it is applied	Barrettine: 4–6 m² per litre on concrete
Bitumen primer	why the base is primed before a bitumen membrane goes down	Sika: 0.25–0.40 L/m² per coat
APP bitumen membrane	APP modified bitumen sheets: thickness, roll size, surface finish	Grupo Puma: 1 m × 10 m roll at 4 kg/m²
Waterproofing membrane	the main sheet types compared	ClassicBond EPDM: sheets up to 15 m wide
Bitumen	bitumen grades and their uses	ORLEN 50/70: softening point 46–54°C
DPC damp-proof course	the layer built into a wall against rising damp	UK Approved Document C: 150 mm or more above ground

Which waterproofing material for which job

There is no single best waterproofing material: each data sheet behind these pages names its own jobs, and the choice follows where the water comes from.

Wet rooms, balconies and pools take a brushed coating under the tiles. According to the JUYONS data sheet, K11 is meant for walls, kitchens, toilets and bathrooms, balconies, basements and swimming pools, and tiles can be laid on the cured layer. Kitovu sells that coating from stock in Zanzibar: K11 Polymer Cement Waterproof Coating (Two-Component). Two guides set out the order of work: bathroom waterproofing and pool and tank waterproofing.

Flat roofs and terraces take a sheet in rolls. Grupo Puma keeps its film-faced APP roll for layers under protection and its mineral-faced roll for the exposed top layer; the APP roll Kitovu holds in Zanzibar has a grey mineral top. Before any sheet goes down, the JUYONS membrane instructions call for primer at 0.3 kg/m², and the JUYONS water-based primer is also in Kitovu’s Zanzibar stock.

Walls at ground level need a damp-proof course in a mortar joint, which UK Approved Document C places 150 mm or more over the adjoining ground. A waterproof render is not a substitute: Palace recommends its render for re-plastering after an injected damp course has gone in, not in place of one.

Tanks you drink from are the strictest case. The Barrettine bitumen paint sheet excludes contact with potable water and the K11 sheet does not mention it, so such a tank needs a product whose own document approves that use.

The Sika waterproofing page covers a brand Kitovu does not stock.