steelight lintel cold bridge !

esox28

have run into a small cold bridge problem, well 3300mm of a bridge. I have a steelight lintel which is a heavy duty reinforced suitable to carry the first floor slab.

my problem is the lintel which has a 303 x 101 rsj incorprated into its structure and the whole lintel spans the 150mm cavity.

Ive seen on boards the some guys are wrapping the steel with aerogel, but I cant seem to locate a supplier at short notice or at all even, a pm would be much apprecated.

any solutions or thoughts

sydthebeat

is the lintel in filled with polystyrene?

esox28

no it is filled with rock wool, but is from the same family of lintels that have the aeroboard in the centres because this is bespoke lintel they couldent get insulation into the web because of welding heat that was needed to manufacture

sydthebeat

any chance you could attached a sketch of the lintel, and how it sits in the cavity?

esox28

don't know will this load!!

http://www.google.ie/imgres?hl=en&sa=X&rlz=1G1ACAWCENIE365&biw=1092&bih=514&tbm=isch&prmd=imvns&tbnid=Iiv181oodwz7_M:&imgrefurl=http://poroton.org.uk/U%2520Values%2520%26%2520Technical.htm&docid=JsXHnGoA52dtPM&imgurl=http://poroton.org.uk/Keystone%252520Lintels.jpg&w=619&h=876&ei=JDXiT--lIM-IhQfT47y5Aw&zoom=1&iact=hc&vpx=280&vpy=52&dur=5850&hovh=267&hovw=189&tx=152&ty=135&sig=116914939532376583708&page=5&tbnh=146&tbnw=103&start=52&ndsp=15&ved=1t:429,r:11,s:52,i:276

this is roughfully what the lintels make-up is except without the polystyrene insulation, it sits on 150mm bearing on each side of block wall ope, it is possible to insert 300mm of insulation into the web of the rsj (right side as you see in pic) but I am still left with a thermal bridge on bottom an top where steel sits on block.
I also have concerns for condensation forming on the cold bridge. should say though that a insulated slab board of 38mm will be installed over the wall in question and its under this slab that I fear condensation will form!!

fclauson

is it too late to change the design

we have steel - but they do not bridge the cavity - our inner and outter lintals are separatly suppoted - but I do have a 250mm cavity