On my single story extension I'm using concrete lintels (as opposed to catnic) on both skins of the wall as the whole lot will be rendered. This will obviously leave the cavity open (but filled with insulation) above where the windows and french doors will be. I was thinking of just using regular cavity closures just as I will around the rest of the opening.
I've searched the forum and have found a mixed bag of responses. As a novice, my thoughts are this - Above the concrete lintel will be 1.5 blocks rendered. Overhanging these will be the exposed rafter roof (no soffits or fasia) by about 30cm.
I've no idea how water could penetrate the cavity above the window, unless there is a monsoon with rain being blown upwards. Not an exposed location either, hence me thinking about leaving the cavity tray out.
Interested on others thoughts - am I mad not to put one in? If you think it's a must, I would simply cut some DPM and mortar it in to the blockwork joints sloping to the outer skin with some weep joints at 450mm (which would look crap on my rendered wall)
I've searched the forum and have found a mixed bag of responses. As a novice, my thoughts are this - Above the concrete lintel will be 1.5 blocks rendered. Overhanging these will be the exposed rafter roof (no soffits or fasia) by about 30cm.
I've no idea how water could penetrate the cavity above the window, unless there is a monsoon with rain being blown upwards. Not an exposed location either, hence me thinking about leaving the cavity tray out.
Interested on others thoughts - am I mad not to put one in? If you think it's a must, I would simply cut some DPM and mortar it in to the blockwork joints sloping to the outer skin with some weep joints at 450mm (which would look crap on my rendered wall)