. Railroad structures and estimates . ELEVATION. PLAN Ice House. ICE HOUSES. 137 APPROXIMATE ESTIMATE FOR A 250-TON ICE HOUSE. (Fig. 64.) Quantities. 20,000 feet board measure lumber,per thousand Doors Hardware Paint Cinders and drain Mate-terial. $ Labor. $ Totalunit. $ Supervision and contingencies. If masonry foundation, add. .Total Cost. $ $ $ Construction. — To avoid shrinkage as much as possible, stoneor concrete foundations should be used for the outer walls;ordinary wood sill foundat
. Railroad structures and estimates . ELEVATION. PLAN Ice House. ICE HOUSES. 137 APPROXIMATE ESTIMATE FOR A 250-TON ICE HOUSE. (Fig. 64.) Quantities. 20,000 feet board measure lumber,per thousand Doors Hardware Paint Cinders and drain Mate-terial. $ Labor. $ Totalunit. $ Supervision and contingencies. If masonry foundation, add. .Total Cost. $ $ $ Construction. — To avoid shrinkage as much as possible, stoneor concrete foundations should be used for the outer walls;ordinary wood sill foundation is not sufficient to preventheat penetrating through the outside ground to the floor insummer. The outer walls and roof should be insulated with at least threecoverings of board and two air spaces, and a vent should extendthe full length of roof. The house should be divided up into a number of compartments,the cross partitions serving to tie in the main walls instead of ironrods; it also serves to lessen the exposure of ice to warm air wh
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