Martin Burlund

Thank you for your comprehensive reply. I use ready made lime mix (it's very expensive. Next time I will pursue other options).

I am happy to hear that you suggests sandstone, because that is just what I got and I am almost at the point of laying them on top. My plan is to use rubble granite in the mortar to balance out the few but inavoidable uneven places on the top of the foundation.

When I connect the anchors between the foundation and the bales, will they not create some sort of moisture transportation or create condensation within?

I already build in anchors in the foundation to attach to the roof beams. these will not go through the straw and cause condensation.

I'm going to Brighton this week for a workshop. Hoping to get a lot of answers there

Once again thanks

Hi all. I have built up my stone foundation with a cob house in mind, but in the end I decided on straw bale. So now I have an uneven surface on top, because that wasn't important before. The house is a one room 15 inside m2 outside 20 m2 with a straight roof declining from 3,5 m to 2,5 m height.

I would like to hear about your experiences making a flat surface from a rocky stone foundation top. I am edging towards a slate or sandstone surface, but I am unsure what to use as a mortar. I'm afraid that the lime mortar will crumble and that the clay mortar will not be strong enough to hold a wall.

I read somewhere here, that you can put a cememt slab on top, but my textbook warns me not to use cement as it will not be flexible and move with the building over time.

Thank you for your input

PS. The house is being built in Copenhagen, Denmark if anyone should be interested