If you need more space or want to add value to your property, converting a basement can be an inexpensive method. Getting the most important elements right in the first instance will be the safest and most sensible decision you can make in the entire conversion process. 


Whether you wish to create a more usable living space for you and your family or if you would like to increase your storage space, ULTRA membrane systems will be able to offer you the best advice on which method is best for your basement.


Type C Cavity Drain System


External basement tanking


The table below defines the environmental performance levels referring to basement usage - (reference BS8102:2009)



Grade 1 allows some leakage due to its intended use, however Grade 3 does not allow any water penetration as the intended use would often be residential or commercial.



As the usage of the basement may change at some point, it is therefore recommended to build the basement to a Grade 3 environment. 


Car Parking; plant rooms (excluding electrical equipment); workshops.
     Some seepage and damp patches tolerable,                    dependent on the intended use. Local drainage
     might be necessary to deal with seepage
Workshops and plant rooms requiring a drier environment; retail storage areas.
    No water penetration acceptable.
    Damp areas tolerable; ventilation might be required.
Ventilated residential and dryness commercial areas including offices, restaurants etc.; leisure centres. 
   No water penetration acceptable.
   Ventilation, dehumidification or air conditioning             necessary, appropriate to the intended use.
A) The previous edition of this standard referred to Grade 4 environments. However, this grade has not been retained as its only difference from Grade 3 is the performance level related to ventilation, dehumidification or air conditioning (see BS 5454 for recommendations for the storage and exhibition of archival documents). The structural form for Grade 4 could be the same or similar to Grade 3.
B) Seepage and damp areas for some forms of construction can be quantified by reference to industry standards, such as the ICE's Specification for piling and embedded retaining walls [1].

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