The Property Care Association and Graham Colman of Remedial technical services have some interesting research in progress.
This is a study of the vapour pressure differentials inside randomly chosen homes around the UK, compared to external measurements. Condensation problems are common and seem to be growing. Those of us involved in condensation and mould control often use BS5250 ‘code of practice for control of condensation in buildings’, as a guide.
The document uses differentials between the inside and outside Vp to help assess the ‘’occupancy’ levels for purposes of defining whether a dwelling is ‘dry’ ‘moist’ or ‘wet’. The data used to define these is outlined in BS5250.
In recent years, as the PCA have introduced many of us to data logging, we’ve come up with a wide variety of data sets and some of us, particularly Graham, have come to question the data behind the levels which are quoted. In particular, houses termed as moist or even wet, do not always seem to have a problem with condensation. So at Graham and Steve Hodgson’s invitation, I and some other surveyors, scattered around the country, are data logging our own houses, with loggers outside too, so that we can provide more ‘real world’ data sets for analysis.
I’ve set two up today (see video). As you can see, setting up data loggers is fast and easy.
I live in a four bed semi, with my wife and daughter (two cats and a two fish tanks). The only mould growth I ever find is between tiles in the shower; nowhere else. The house is centrally heated and there are five extractor fans (two in the kitchen, the others are in baths and cloaks). This should be a dry occupancy – lets see what the data tells us over the next few months.
Once collected the data will be sent to the PCA for adding to the database.
If you would like to participate please set at least two loggers up. One internal and one external. Set them for 1 hour intervals. make sure the external one is sheltered from rain and direct sunlight. For further information talk to Steve at the PCA or Graham Colman at RTS.