Training on the Use of Sand for Producing Galvalume Roof Composites for Darul Muttaqin Batu Islamic Boarding School Students

The extensive use of galvalume roofing in Darul Muttaqin Batu Islamic Boarding School offers practical advantages, including light weight, durability, and ease of installation. Nevertheless, this metallic roofing material can reduce thermal comfort because rooms beneath the roof become hotter during strong solar exposure. This community service program aimed to introduce a sand-epoxy composite coating as a simple technology for reducing heat transfer through galvalume roofing while serving as a practical learning medium for students. The activity included a partner needs assessment, preparation of tools and materials, a theoretical explanation, a demonstration of sand-epoxy mixing, hands-on coating practice on galvalume sheets, and evaluation of participant responses. Sand was selected as the filler because it is inexpensive, locally available, and feasible for use in an epoxy matrix. The results showed that students could understand the basic concept of composite materials, identify the function of each component, and conduct the coating process under technical supervision. A trial application in a 2 x 5 m room showed a decrease in air temperature, making the room more comfortable to use. In addition to producing a prototype of sand-epoxy-coated galvalume roofing, the activity improved students' awareness of how local materials can solve technical problems in the boarding school environment.