The best method to make a deep litter bed is with wheat straw. The way to do this is to cover the floor lightly with 50% sand and 50% lime. Then break up a bale of straw and cover the floor around one foot deep while the straw is loose. This straw bedding will pack down to about six inches. To clean, you just walk through and pick up the droppings and put them in a bucket. Each week turn the top of the straw and add a little more. The advantages of this floor cover are its insulation qualities and its dryness.
Taken from The secret of speed
by E.J. Sains
TCC Loft uses Stable Boy, instead of sand & lime (much safer product). Never open a bale of straw in the loft if unsure of the source. Do not place straw in corridors and areas you frequently walk on, as it quickly breaks down into a smaller unstable size.