Hi,
Hope someone can shed a little light for me.
We have had wooden sash windows installed. In one particular bedroom ( whose extrernal wall is south facing and hence bears the brunt of the "weather" ) I have yet to make good the internal wall in the bedroom and between the underside of of the sash window and internal brickwork is a gap of approx 8mm, as follows:
When I've looked into this gap, on the underside of the sash window, I've noticed water droplets have appeared. At first I thought the external mastic seal had failed, letting in rain, but I now know that the water droplets are due to condensation. I've proved this by inserting a cut up plastic folder into the gap, left it overnight ( when it didn't rain ) and sure enough the brick facing side of the plastic is covered with water droplets. I can only presume that the underside of the window is cooling quicker than the bricks ( which heat up throughout the day), and then condensation forms overninght.
Question is, what should I do about this? Fill the gap with mortar? put a DPC on the brick and then mortar?
The wall is no a cavity wall ( Victorian House ) and the whole wall will be taken back to brick and re-plastered soon.
Any help appreciated!
Hope someone can shed a little light for me.
We have had wooden sash windows installed. In one particular bedroom ( whose extrernal wall is south facing and hence bears the brunt of the "weather" ) I have yet to make good the internal wall in the bedroom and between the underside of of the sash window and internal brickwork is a gap of approx 8mm, as follows:
When I've looked into this gap, on the underside of the sash window, I've noticed water droplets have appeared. At first I thought the external mastic seal had failed, letting in rain, but I now know that the water droplets are due to condensation. I've proved this by inserting a cut up plastic folder into the gap, left it overnight ( when it didn't rain ) and sure enough the brick facing side of the plastic is covered with water droplets. I can only presume that the underside of the window is cooling quicker than the bricks ( which heat up throughout the day), and then condensation forms overninght.
Question is, what should I do about this? Fill the gap with mortar? put a DPC on the brick and then mortar?
The wall is no a cavity wall ( Victorian House ) and the whole wall will be taken back to brick and re-plastered soon.
Any help appreciated!