We have all aspects of the damp proofing trade covered.

AD Damp Proofing - Offering a wide range of damp proofing services for many year to our clients in Accrington

Damp proofing

The most effective way of treating damp is by chemical injection.

AD Damp proofing only use chemicals that are BBA approved, the BBA (British Board of Agrément) rigorously test every creation.

Consequently we are able to offer a 30 year Insurance Backed Guarantee on the cream that we use for our chemical damp proof courses. The chemical level stops the liquid by climbing past it, therefore forming a waterproof barricade in the base of the structure/wall.

Re-plastering Even when a new damp proof course has been installed and the rising dampness controlled, the wall will still have water from the former dampness, together with salts passed up from the ground.

These will remain to attack plaster and decorations. Gypsum based plasters will be transformed by the action of the salts so that they essentially entice liquid from the air, and by no means dry out. It is consequently significant that the old affected plaster is removed and replaced with a superior plaster which repels any attacks by the salts. This is occasionally referred to as renovating plaster or chemical rendering and can be purchased as a special plaster system or mixed according to a particular specification.

If not stated, our quotations will automatically assume that existing plaster thickness is not more than 25 mm (1 inch). If when the plaster is removed and the thickness is found to surpass this, additional costs may occur for dubbing out coats of rendering which will be needed to bring the fresh plaster up to the level of the current plaster.

This may increase the cost of the work undertaken due to time, labour and materials involved. In the event of this occurring you will be made aware of this before any further work commences.

Tanking

Transforming a damp cellar or basement can be an astonishingly economical way of accumulating living space and can significantly accelerate the value of a property.

Tanking and waterproofing of cellars can transform basements into a variety of light liveable damp free areas i.e. Bathrooms, Kitchens, Studies etc. the possibilities are endless, the only thing holding you back is your imagination. Turn that damp, gloomy area into a bright, gleaming area.

  • Issued Independently.
  • No Minimum Charge.
  • No VAT. Single Premium Payable.
  • Vetted by the Department of Trade and Industry.
  • Vetted by The Financial Services Authority.
  • Issued only by registered contractors working to BS6576 for damp proofing and to the Property Care Association’s codes of practice for all other remedial treatments.
  • Up to 30 years Protected Guarantee.
  • Contractors must have had formal training and certification by a Chemical Manufacturing Company or by the Property Care Association which is the monitoring body for the remedial industry.
  • Cementitious Structural Waterproofing:

The Basement Tanking System is a multi-coat waterproofing system that is both hard-wearing and adaptable. The main coating material, Vandex TT55, is a cement-based powder which is mixed with water and applied to walls, floors, and ceilings by trowel. Providing the substrate is structurally sound, it sets to form a bond with the masonry substrate, creating a watertight barricade to the penetration of water. A sand-cement render is applied to the walls and a bottle cove formed at the wall-floor junction using Vandex Unimortar 1. Two coats of tanking are then applied to the walls and floor. Finally, a screed is applied to the floor and a suitable plaster is applied to the walls.

Dementisious structural waterproofing

The system that we use is a Cavity Membrane System: This is particularly suited for damp proofing in old and unused cellars to create a damp free area. Therefore Victorian style basements are most subject to using this system and have been frequently been used throughout the U.K. With this system it is irrelevant of the condition of the substrate for its effectiveness. Membranes are specially sealed to the walls using specialists fixing plugs and floors there is no need for any form of fixing.

Oldroyd Xv can be concealed with plasterboard (by means of timber battens or the Fast frame Dry lining System), screed, or a floating timber floor. This system will include a sump, pump and will need to be included as part of the drainage system. The Aquadrain perimeter drainage channel may also be used on the affected walls to provide added drainage at the wall-floor junction.

Condensation Control

Condensation, as the name suggests, is water which has condensed from warm moist air on contact with a cold surface.

Air holds water in the form of water vapour (moisture) warm air is able to hold more moisture than cold air. Air which contains its maximum moisture content is said to be saturated.

When does condensation occur?

Condensation is chiefly a winter problem. The external air temperature is low, and the external walls and windows are cold. The usual sequence of events is as follows ;

  • Cold air enters the building.
  • The air is warmed up for the comfort of the occupants.
  • The warm air takes up moisture.
  • the warm moist air comes into contact with cold surfaces, walls and windows etc and is cooled below its dew point
  • condensation occurs as excess moisture is released.

Walls in kitchens and bathrooms (where moisture levels are usually highest) solid external walls, cold bridges such as concrete lintels set in cavity walls are commonly the areas in which condensation points for damp air.

Sources of moisture

  • Paraffin and unventilated gas heaters.
  • Cooking
  • Clothes washing and drying
  • Baths, dish washing, etc
  • Occupants
  • Health concerns associated with condensation and damp

Asthma is heightened due to condensation, moisture, humidity, and water intrusion, which all contribute to indoor moisture. Mould infestation is a major trigger for asthma. Aside asthma, other health concerns of mould are infections, allergenic or immunological illness, and non allergic illness. Asthma is also triggered by the sensitization of dust mites accruing humid, wet regions of a structure. Another health effect associated with structural dampness is the presence of bacteria in an indoor environment. Bacteria requires water to grow and multiply. Bacteria is a source for the transmission of diseases, therefore putting occupants’ health at risk by water intrusion into the indoor environment. Water removal and drying of wet building materials within 2 days will likely prevent mould and bacteria growth, therefore reducing occupants’ vulnerability to disease.

This could be especially detrimental to the elderly or the very young.

Effective treatment of condensation

PAM Positive Input Ventilation uses air displacement to ventilate a whole dwelling, thereby improving indoor air quality and stopping or preventing condensation problems from occurring. Predominantly designed for installation in existing properties.

A single fan unit mounted in the roof space (for central location for flats) supplies fresh, filtered air into the dwelling via a central hallway or landing. This creates a slight positive air pressure which forces stale, vapour-laden air out via fortuitous air gaps or through humidity sensitive window vents.

The PAM PIV Loft Unit comprises a fan with connector duct and ceiling diffuser. The fan runs continuously, unless the loft temperature exceeds 25°C when the unit will switch off. Above this temperature the hot incoming air would be uncomfortable for the occupants and the risks of condensation are somewhat reduced. When the temperature falls below 25°C, the unit will automatically switch itself back on. At temperatures between 19°C and 25°C the unit operates in heat recovery mode, harnessing the benefits of solar gains whereby the air in the loft is warmer than outside air.

The ceiling diffuser has been aerodynamically designed to direct incoming air along the ceiling (coanda effect) where it mixes with warm, buoyant air before re-circulating downwards, thereby ensuring a more even thermal gradient between the floor and ceiling.