Hi All,

I'm an owner builder, alongside my registered builder buisness partner (we run an electrical contracting business) we are building a new home for myself.

After the last few days of heavy rain. I came into the garage and noticed these internal bricks are wet. Roof and flashing have been on since before the start of winter and this is the first occasion I have seen the bricks wet on the internal leaf.

I am hoping someone here has some advice or can point me to the cause. If this was the first rain the house had seen I'd be concluding there is water ingress somewhere and attempting to find the source however this is not the first bit of rain we've had but it is the first time this has occurred.

Some information about where these wet bricks are located; double brick cavity wall in the garage on the western side if the home. No insulation inside cavity. The top of the wall has a cap flashing which is in sound condition I confirmed that yesterday. So I don't believe water is getting in from the top. The windows are standard bricked in windows with apron flashings on both the top and bottom of the window frame.

It appears like moisture is being drawn in via something that has bridged the cavity (mortar slag/bricktie) but in all my years of working on building sites I have never seen it before. Is it possible that the external leaf of bricks being so saturated from the repeated down pours is leaching water through the mortar and then tracking through a brick tie? Or is it a more likely water is inside the cavity and pooling then running down the wall until it meets an obstruction? What makes the most sense is the window frames are letting water in but I'm not sure how or why only now. Water tracking in from the lintils? The frame sill filling up with water and then draining into cavity ?

I'm not concerned about the wet bricks outside (they are obviously just wet) but I posted to give an overview of the wall, windows and cap flashing that is installed.

Few people I've spoken to with years in the game were a bit stumped as well.

Hoping to get advice from other builders or bricklayers or anyone who has experienced similar.

Cheers