I just use a sheet of XPS rigid insulation 

> On 02-Jun-2018, at 20:29, Jim Arnott <jrasite@EONI.COM> wrote:
> 
> Re: Working on gravel. My employer buys big spools of fiber.  The spools usually have a protective cover of a hard plastic with a foam backing.  It beats the socks off of cardboard (or plywood) to lay under my vans on. 
> 
> I can’t seem to find it using the Googles.  I’ll drop a note on our supplier Monday and find out what it’s called and who supplies it.
> 
> Jim
> 
>> On Jun 2, 2018, at 1:31 PM, Neil N <musomuso@GMAIL.COM> wrote:
>> 
>> Thanks for that.
>> 
>> Working on gravel kind of sucks. Wheel ramps sure help and I prefer wooden
>> ones.
>> 
>> Neil.