The IET is carrying out some important updates between 17-30 April and all of our websites will be view only. For more information, read this Announcement

Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 34 replies
  • Subscribers 31 subscribers
  • Views 11895 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Wall Cavity Wiring.

Zoomup
Good morning on this bright and sunny start,


                          Q. Which regulation(s) specifically prohibit(s) the installation of cables in brick and block cavity walls within the cavity?


in a, Older premises?


    b, Newer premises?


If regulations exist, what reasons are provided for the prohibition? Or are we just concerned about chemical damage of cable insulation if the cables are in contact with some types thermal insulation?


Z.
Parents
  • 0
    Given that very few single skin brick walls such as found on garages and better class sheds and so on actually have water running down the inside and even fewer houses with solid walls of double brick construction suffer from anything more than damp that can be mitigated by good ventilation, I think the water in cavity problem is not as bad as  suggested - if it was we would be drilling holes to make extra weep vents and seeing water pee out in a vigorous jet on those buildings that have them, and this is not the case.

    It is clearly a bad idea to bridge the cavity, and there are a few spectacular cases where the building has had serious problems already and adding blown fibre wall insulation has basic filled the cavity with something like soggy cotton wool. I suspect an odd length of T and E won't make that much difference, it is scarcely a good wicking material.
Reply
  • 0
    Given that very few single skin brick walls such as found on garages and better class sheds and so on actually have water running down the inside and even fewer houses with solid walls of double brick construction suffer from anything more than damp that can be mitigated by good ventilation, I think the water in cavity problem is not as bad as  suggested - if it was we would be drilling holes to make extra weep vents and seeing water pee out in a vigorous jet on those buildings that have them, and this is not the case.

    It is clearly a bad idea to bridge the cavity, and there are a few spectacular cases where the building has had serious problems already and adding blown fibre wall insulation has basic filled the cavity with something like soggy cotton wool. I suspect an odd length of T and E won't make that much difference, it is scarcely a good wicking material.
Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines