I am about to have a ROR observatory built by BYO and I am going back and forth in my mind as to concrete slab versus wooden deck floor option. I know that this issue has been discussed frequently here and after reviewing what I could find on this forum as well as other web searches I am still unsure on the best approach or if I am just splitting hairs.
My main goal is for remote astrophotography and it is that consideration which is the primary one in question. However I also need to plan for the observatory's alternate use which will be for visual observers when I'm not using it and also when I'm too old to do to anymore. I have pretty much decided that I will isolate the telescope piers regardless of whether it is a slab or deck floor although one could make the argument that that doesn't really matter if I am doing just all remote. So my main concern is the thermal issues with concrete. Although the slab will be covered all day by the roof, the interior temp can get very warm in summertime. I understand the slab may stay cool because it's in the ground but if its warm enough inside wouldn't there be some heat transfer to the concrete even though heat rises and then be some slow dissipation at night.
BYO has options for air conditioner cutouts and roof vents ( I will probably definitely add the vents) plus the roof is metal not asphalt shingles. So I assume some folks do use air conditioners and other climate control measures. I also saw where some folks put roof radiant barrier insulation in as well and where some insulate the entire structure. Also seeing that there are remote observatories that use concrete slabs out west one would assume that it is really not that big of an issue but maybe they have interior climate control
I know I could just go with the wooden deck and be done with it but the concrete floor does have some advantages that scopes could be setup on tripods for visual or moved around easier in the future. Also I will have a large (18") DOB that will be all set up in there but stored to be wheeled outside for visual observing in addition to the astrophotography piers . In order to use all of those in the observatory I would need to spend a lot more money for a larger structure, additional DOB pad, and reduced open wall height but I am not considering any of that.
So my question is....... Do most of you with ROR observatories with concrete slabs that you use for astrophotography have internal climate control to handle any thermal issues with using insulation, air conditioners etc. or is it really not that big of an issue as long as you open the roof for a couple of hours prior to using? Do you see any negative effects with your images that you can correlate with thermal currents from the concrete floor. Or as I said earlier am I just splitting hairs. I will probably be using mostly narrowband imaging because my area has heavy light pollution and marginal seeing most of the time. I would rather not add thermal issues to the mix.
Thanks for any feedback you can give. Chris