Salute to Tuckfook for sharing his insight on Red Brick and double layered walls

Tuckfook quoated" There are several types of red bricks. The highly fired red bricks are not as porous as the less fired ones and the types made of red laterite and cement mix are the most porous. By porous I mean that they absorb water and retain the water in the brick without leaching out. Sand and cement bricks are the least porous in comparison and even though they readily absorb water, they do not retain it as long as the clay bricks. I am using double layer red bricks (cement and laterite) with lime plaster on both sides. lime plaster is more porous than 100% cement plaster. With this construction, my internal stable humidity is about 20% higher than external ambient all the time, thereby maintaining no less than about 75%Rh all the time without humidifier running. My humidifiers do not run most of the day. The gr flr. does not switch on at all so much so that I have to manually activate it to make sure it still works. Only the top flr. humidifiers run for about 30 mins in the evenings. Insulation is not a problem as with porous bricks the water evaporates from the inside to the outside. As this happens, there is an appreciable temperature drop keeping the walls cool. In wet weather the bricks absorb water to be saturated and that traps the heat inside stopping it from being too cold, when it is hot and dry outside, water evaporates and maintains the cool internal temperature. Of course the thicker the better but there are limitations as to how thick we can build a wall. If you want physical heat insulation then use double wall with styrofoam sandwich but you will encounter internal condensation, and need good airflow control to be able to control the temperature."



This help me and hopefully many others to understand the purpose of double layered wall for the stand alone swifltet house in the farm!