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Product Spec Sheet: 
36" x 30" Thermally Broken Domed Roof Hatch - Bilco
Do you want to add some more light into your building? Even the large glass windows are still not enough, which is why you have to install the Type GS-50TB Thermally Broken Domed Roof Hatch.
If you need to know the specifications, the Type GS-50TB has a thermally broken curb with integral cap flashing 11 ga. Aluminum with corners fully welded. It also has an extruded aluminum frame, and a double dome with sealant all around (clear polycarbonate over clear polycarbonate). The curb is a 3” (75mm) polyisocyanurate insulation, and a condensate channel with drainage to exterior. Security is a must, which is why there’s a slam latch with inside and outside handles. It also comes with a padlock hasps and a lock strike.
Lifting it open won’t be a problem because of a lifting mechanism with reinforced composite tubes and compression springs. If ever you need the Type GS50TB, make sure you get it at BestRoofHatches!