shed help please

[redbull360]

i have build a summer house 12ft by 15ft, the problem is i laid it on slabs and the floor base sits on the slabs i didnt leave room for air flow.
what can i do, please if you have any idea please let me know

 

[big-all]

heeelllooo and welcome redbull360

is the base a box section or rows off joists

 

[redbull360]

the base is a box like this


a box with straight joint

shed base

• redbull360
• 15 May 2013
• 1

the green squares the slabs under the box
i have put membrain over the slabs before the joints

 

[big-all]

as the structure is too heavy to raise onto bricks your
choices are make holes or remove sections in non load bearing sections to allow through air flow
or dig channels through the earth although they will fill up with water

 

[redbull360]

i have laid laminated flooring, could i put drop vents in the floor so the air flow would that work, i have vents in the wall at the tops each end of the shed, just i fort please need me know,

 

[big-all]

the vents really need to be underneath in a fashion to allow through draughts so you have at least 2 vents on different sides on what would otherwise be an enclosed box