Re: Hot Roof Insulation on a Stone House
What is proposed is a modern way of insulating the attic spaces.
Originally Posted by 1967 R50/2
By insulating all the exterior surfaces and eliminating the venting of the attic you are directly reducing the heat gain/loss within that space and subsequently reducing the heat gain/loss for the living space --- a positive benefit.
Generally the moisture comes from warm humid outside air and within the living space from day to day activites-- cooking , showers , cleaning , etc..
Moisture generally originates from vapour and the mechanisim known as vapour drive is one of the common ways moisture transfers from the living space into attic or from the attic to the living space.
Much like the basic laws of thermal dynamics -- heat travels to cold ( simply put )
so does vapour drive .
In the colder winter when the living space is being heated and a vented attic space is at the same temperature of the outside. Because of this difference in temperature is why you will have heat loss. The closer the two spaces are in temperature the less heat loss.
The same is true during the summer when you are cooling the inside living space --- just in reverse. The heat from outside is trying to get in producing heat gain.
The same holds true with the vapour drive. During the cold winter the warmed inside moisture laden air will be driven into the cold vented attic space and condense once it contacts the colder attic. The opposite occurs during the warm summer when hot outside air is driving inward.
Regardless of the fact your home is contructed of stone , making the living space more air tight will have an effect of increasing of the inside humidity ( moisture ).
Up here we have been using Heat Recovery Ventilators ( HRV ) which are also being referred to as Energy Recovery Ventilators ( ERV ) for a quite of number of years now --- google them to learn more.
These devices are pretty much standard to greatly reduce moisture issues as well as improving inside air quality and is something I recommend looking into.
Hopefully this helps.
"" an ounce of perception -- a pound of obscure "