Crumbly Vermiculite/Portland Cement

[david s]

8:1 is too rich, you have added much more mass with the extra cement and this will reduce its insulating capacity. To compensate you will have to thicken the vermicrete layer. I let it dry for a week before doing another layer,that way at least the weather can do a lot of the moisture elimination for you.

[eatingmorefood]

David,
thank you for the info. !
I read a few things about the top layer of "stucco" to seal the insulation. Is this ordinary mortar mix ? Do you use anything in between ?
I am using green board over my steel frame on sides and the back is open and will have mesh reinforcement to help hold mortar.
EatingtMoreFood

Cooked a batch of BBQ Chicken, Apple Spice Cakes & Devils Food Cakes today

[mrchipster]

Originally Posted by eatingmorefood

David,
thank you for the info. !
I read a few things about the top layer of "stucco" to seal the insulation. Is this ordinary mortar mix ? Do you use anything in between ?
I am using green board over my steel frame on sides and the back is open and will have mesh reinforcement to help hold mortar.
EatingtMoreFood

Cooked a batch of BBQ Chicken, Apple Spice Cakes & Devils Food Cakes today

Stucco mix can be purchased at any home improvement store, others have used fiber reinforced cement also one brand is quikwall for building concrete block walls without mortar. I used it to line my swimming pool it is completely waterproof so if you use quikwall add some vents to let out any moisture that may build up.

Chip