Guide to waterproofing inside and out
For interiors and exteriors in new and old buildings alike
Most damage caused to the fabric of a building is usually caused by moisture or water at the heart of the problem. This occurs from the roof right down to the basement or cellar. So how can it be stopped and protected? You’ve guessed it – waterproofing!
What is waterproofing?
Waterproofing is the creation of an impervious barrier over the surfaces of your building, outdoor surface or material to stop water getting in. This may be on roofs, walls, masonry, wooden cladding, basements, cellars foundations, driveways, patios, decks etc.
See out Find Waterproofing Products page to see visually what can be waterproofed.
Types of waterproofing products
Cementitious waterproofing is probably the easiest method of waterproofing a building since it’s easy to mix and apply.
Cementitious waterproofing coatings are breathable, seamless coatings, providing positive and negative side waterproofing protection on concrete and masonry surfaces. They prevent damage from water infiltration and resist mold and mildew.
Cementitious waterproofing is applied as a slurry and acts as a damp proof membrane for brickwork, concrete or any cementitious substrate. A flexible waterproof coating for use where vibration or cracking is anticipated.
Typical applications of cementitious waterproofing are basements, cellars, toilets, showers, wet rooms and other internal wet areas. Ponds, water features and concrete tank waterproofing are some of the outdoor jobs that can be done.
Liquid Applied Membrane
Liquid Applied Membrane (LAM) is a monolithic, fully-bonded, liquid-based coating used for many waterproofing and roofing applications. The liquid coating cures forming a rubber-like waterproof membrane and can be used on asphalt, bitumen, concrete and similar substrates.
Typical applications include waterproofing roofs, flat roofs, basements, terraces, wet rooms, tanks etc. Apply to bitumen, brick, concrete, stone, metal, wood, fiber cement etc.
A bituminous membrane is a type of roofing system for buildings used to create a watertight roof made from modified bitumen usually comprising of two layers. Other types of membrane roofs are made from synthetic rubber, PVC or thermoplastic.
Bituminous membranes are good for waterproofing roofs, flat roofs, basements, cellars and similar structures.
Bituminous coatings are used to build a waterproof and flexible protective coat for waterproofing under water structures, steel work weather protection, concrete foundations, waterproofing wood, concrete and potable water tanks.
Bituminous coatings are made of bitumen or coal tar which is dissolved in mineral spirit or naphtha. Bitumen is also known as asphalt which is sticky, black, and highly viscous liquid or semi-solid form of petroleum. Natural bitumen is found in deposits of oil sands and pitch lakes, whilst refined bitumen is gleaned from the distillation of crude oil.
Polyurethane Liquid Membrane
Polyurethane Liquid Membrane is a cold applied, odour free waterproofing solution for refurbishment of old buildings and new builds.
A big advantage of Polyurethane Liquid Membrane coating is, unlike conventional roofing systems, it forms a seamless membrane on the roof and is able to waterproof round details easily. Once applied typical cure times are about 24 hours.
Polyurethane Liquid Membrane coating is typically used to waterproof flat roofs, pitched roofing, metal cladding, car parks, gutters, vents, pipes, rainwater outlets, parapet walls, rooflights, heating, ventilation, air conditioning and ducting.
What are Type A, Type B and Type C waterproofing?
BS 8102: 2009 ‘Code of Practice for the Protection of Below Ground Structures Against Water from the Ground’ is the British Standard which gives recommendations and provides guidance on methods of dealing with and preventing the entry of water from surrounding ground into a structure at below ground level. It defines three types of waterproofing products – Type A, Type B and Type C.