RABBET DEPTH FOR LEXAN™ SHEET Sheet Length (In) 24 36 48 60 72 96 120 Temp Decrease (F) Temp Increase (F) CALCULATE CLEAR Edge Engagement (in) Contraction (in) Expansion (in) Rabbet Depth (in) * Use long dimension for sheet length.* Temperature increase and decrease represent change from installation temperature.* Edge engagement based on 40 psf.