I have read lots in this forum recently and I see this practice of removing bricks to get your ventilation in....
....yet I see no posts about how bad/dangerous this can be for you/your family/your house so here it is...
Chimney
This is fine as long as you have no gas appliances using the chimney. If you have an appliance using the chimney and you knock a brick out anywhere in the line from the appliance to the chimney pot, the chimney WILL NOT WORK PROPERLY and you run the risk of carbon monoxide build up in the room where the appliance is...
Chimneys work on a venturi principle, air flowing over the top of the chimney pot outside creates suction down the chimney, this is what pulls out the gases produced by the appliance. If you pull a brick out and attach ventilation, the venturi will not be effective at the bottom (Gas fire/boiler etc.)
Eaves
This is a potential disaster waiting to happen, you run the risk of allowing wind blown rain or overflow from guttering inside your house. The bricks are there to stop this happening
Also, if doing an attic grow room, remember this..
The roof timbers need to breathe so mould/rot does not occur, this is why attics are draughty and only insulated on the floor. Enclosing spaces with kingspan/celotex or similar is fine but leave air gaps between insulation and roof tiles/timbers to allow circulation. Plastic sheeting also can trap moisture so, again, make sure you have good air circulation otherwise mould/rot WILL happen
Rant over, be safe
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