Last week NHBC released one of their periodic ‘Technical Extra’ publications, and this edition exclusively deals with the waterproofing of basements and other below ground structures.
As I understand it NHBC have approximately 80% of the structural warranty insurance market, and so they have felt the effects of basement waterproofing failures more than any other. More specifically, since 2005/6 they have spent within the region of £21m on remedial basement waterproofing. Continue reading New NHBC Basement Standard – 5.4 Waterproofing of Basements and Other Below Ground Structures.
This is an article written by David Bucknall, Technical Director at Newton Waterproofing Systems. I’m a fan of Newton’s, in part because of the product range and also because most of the staff have a background in contracting (in waterproofing) and so they understand what it is like at the sharp end, implementing works and then promising clients protection for a decade.
This a link to Newton’s post, which also includes a link to the article.
As intimated in this post, British Standard 8102 Code of practice for the protection of below ground structures against water from the ground, is the primary design guide which we and others rely upon in our work designing and installed structural waterproofing systems. As an ‘approved code of practice’ it has an elevated legal status versus other design guides and hence its importance.
One of the key considerations listed is that of defects and remedial measures. In essence designers should assume the risk that any given waterproofing system might not be installed defect free, with risk of defects being associated either with workmanship or the products installed. Continue reading Defects, Defects and Defects (BS8102).
Part of the process of waterproofing design laid out within BS8102 Code of practice for the protection of below ground structures against water from the ground, relates to assessing the nature of a given site, and then using this information to influence your design.
In essence the ‘nature of the site’, can be interpreted as ‘how wet is it, and how wet is it likely to be’?
This is important because the greatest driver of risk, is essentially how much water there is, or potentially will be in the ground, to pressure upon the basement structure and waterproofing system(s). Continue reading Assessing Sites with a View to Assessing Risk.
So it might be hard for most of you (ok perhaps all of you) to get excited about a British Standard, but this is not just any standard, this is British Standard 8102 (2009) Code of practice for the protection for the protection of below ground structures against water from the ground..!
For those of you still reading, BS8102 has importance in basement waterproofing, because as an ‘approved code of practice’, it has an elevated legal status versus all of the other design guides that are available.
What this means is that if we (or others) seek to sell services as designers or installers of waterproofing systems, and do not comply either through choice or ignorance, and issues occur as a result, then it is likely that we would be found liable of negligence under duty of care.
Therefore, at least in my opinion, it is important to fully understand and act upon this guidance, which is not necessarily straightforward, but this is where dedicated designers and installers are beneficial in interpreting requirements within a given situation.