floor sill

floor sill

[′flōr ‚sil]
(mining engineering)
A large timber laid flat on the ground or in a level, shallow ditch, to which are fastened the drill-platform boards or planking, or which is used as the base for a full timber set.
References in periodicals archive ?
To finish off a whole basement with scores of wall furring strips and/or floor sill plates, you can spend as little as $20 for the hammer-activated gun or $70 for the trigger-activated type (shown in Photo 2).
Overall, high-strength steel accounts for 48% of the unit body, including applications on the A- and B-pillars, floor sills, roof frame, cross braces, and floor cross members.
The floor sills are low so it is easy for small children and the elderly to clamber in and out of and the luggage floor is also low, which makes loading and unloading easy.