Excellent workmanship on their firestopping work. From packing mineral wool, applying firestopping sealant, and spraying firestopping material, the installation work is amazing, very clean, and neat. This really demonstrates that they put their pride and heart into the work. Their shop drawings and sign-off documents are very organized as well. They also provide detailed photos of the firestopping installation. That makes the project close-out stage smooth. Well recommended firm for the firestopping work!