Congrats- usually takes me quite some time to explain this to people
The simple answer is that so long as you are within the single layer weight rating, it's not really a concern but if you're close then understand that while you're unlikely to get a blowout failure, you may find the bridge wears out prematurely.
In truth though- for any sleeping pad you'd realistically use; what you actually have is a single layer with an integrated bed sheet.
I cannot comment on the RR as even with a thick pad I find it barely usable. Not crap talking just being blunt.
I did a few double layer designs with my bridges to play with this concept a little and the best answer I can give you is roughly 5/8" foam seems to be the balance point.
The pad I used specifically is the 30" version of the ridgerest from thermarest.
So best I could say- 5/8" of so would balance somewhat. Maybe 2/3 bottom layer 1/3 top layer as far as loading the fabric.
As mentioned, the loads are not necessarily failure ratings, but durability ones.
I test most of my stuff to a minimum of 90 days each by 10 testers with the expectation you'll get 120-150 nights average use once you clear that 90 day hump.
For most people that standard is essentially 'bomber'. 120 nights is going out one weekend a month, every month, for 5 years.
It's also roughly how many nights you'd use a product (on the trail not counting zeros) on an average long distance hike of roughly 5 months duration.
Bookmarks