Breathe paper under the beam slab??

[Cats]

I have an old chapel that I am now renovating, and before I close up the kitchen floor and while I can still access under the house in the crawl space, I am considering stapling a vapor-open wind barrier under the joists on the floors that I won’t be taking up and that are poorly insulated. However, I keep going back and forth on how sensible this is and how much of a difference it would actually make. The house stands on a stone foundation with 5-6 crawl space vents. I am a bit worried that the climate for the joists might change negatively with the wind barrier, and not that much wind gets in there anyway. Most of that area will only be slightly heated in the winter.

Grateful for opinions, tips & advice.

 

[vectrex]

I have an old chapel that I am now renovating, and before I finish the kitchen floor and can still access underneath the house in the crawl space, I am considering stapling diffusion-open windproofing under the joists on the floors that I won't be lifting and which are poorly insulated.
But I'm wavering back and forth on how sensible it is and how much difference it would actually make.
The house stands on a stone foundation with 5-6 small openings.
I am a bit worried that the climate for the joists will change negatively with the windproofing, and not much wind comes in under there. Most of the area will only be slightly heated in winter.

Grateful for opinions, tips & advice

I can't see how the measure you're suggesting could change anything for the worse. It should be a good measure to take, especially if it isn't airtight today.
Don't think of it as windproofing, but rather as protection against convection (drafts). It greatly improves the insulating capability to make it tight.

 

[Cats]

I can't see how the action you suggest could make anything worse. It should be a good action to take, especially if it isn't airtight today.
Don't think of it as a wind barrier, but rather a protection against convection (drafts). It does a lot for the insulation ability to make it tight.

Thanks for the response!