green damp proofing system
- Thread starter calvert
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Is this what you mean - taken from an old book. Don't know if it's Dutch or green, or if in fact it worked. I would imagine the bricks would have to be fairly soft and porous for it to work
These systems have been around in one guise or another for many years. Holland, Dutch, clay pipe come to mind.
I've never seen any controlled tests or independent accreditation for any of the systems, so that rings a few alarm bells
I know of some people who swear that these things work, but what is never apparent is what particular damp problem existed in the first place, or what other work was done internally
They tend to quote science to validate the claims (evaporation and air vortices), and whilst the science is sound, I do doubt that it actually works as claimed within those little tiny holes
I've never seen any controlled tests or independent accreditation for any of the systems, so that rings a few alarm bells
I know of some people who swear that these things work, but what is never apparent is what particular damp problem existed in the first place, or what other work was done internally
They tend to quote science to validate the claims (evaporation and air vortices), and whilst the science is sound, I do doubt that it actually works as claimed within those little tiny holes
this is what i am looking at www.dampproofing.com
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What a misleading site. Its full of nonsense.
From their "Tried and tested" page they mention a "scientific study" but don't actually cite the report, name it or provide examples or links.
If they are referring to the Dutch TNO report from way back, then they are blatantly misquoting it and using parts of it selectively.
And then have the audacity to use a quantity surveying students dissertation as a basis for an independent report. That's tenuous at best
It's smoke and mirrors. It's in no way a proven method, nor is it even a professionally recommended method, and after all these years, ask yourself why it is not even certified.
From their "Tried and tested" page they mention a "scientific study" but don't actually cite the report, name it or provide examples or links.
If they are referring to the Dutch TNO report from way back, then they are blatantly misquoting it and using parts of it selectively.
And then have the audacity to use a quantity surveying students dissertation as a basis for an independent report. That's tenuous at best
It's smoke and mirrors. It's in no way a proven method, nor is it even a professionally recommended method, and after all these years, ask yourself why it is not even certified.
I saw a report on these systems a few years ago. If I recall correctly the basic conclusion was that they work when the air pressure, temperature and wind flow is favourable. The question is how often do those conditions occur in reality? From memory it found that those conditions might (might) occur on one or two elevations of a house but it would be highly unlikely on all four. The most likely outcome would be success on one elevation for some of the time. Of course the manufacturer's would claim otherwise but my guess is they test in ideal conditions.
Yes that was the report from the Dutch TNO - Organization for Applied Scientific Research from the mid-80's
Basically the theory would work if certain conditions existed in a certain way at a certain level ..... for all the time. Their test was limited in scope and were laboratory tests not real-life studies.
Also the walls used for the test have different construction to ours in the UK, and the conditions simulated were not the same conditions as UK prevailing weather would be.
Basically the theory would work if certain conditions existed in a certain way at a certain level ..... for all the time. Their test was limited in scope and were laboratory tests not real-life studies.
Also the walls used for the test have different construction to ours in the UK, and the conditions simulated were not the same conditions as UK prevailing weather would be.
For what it's worth, I have seen a very old installation of the original triangular ceramic tubes perfectly preserving a hundred metres of brick wall in the barracks in Albany Street, Camden, NW1 in London. As you walk past this long wall, the line is obvious where the tubes stop and the badly deteriating wall continues, although it is all the same wall.The principle certainly works.
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