It's a 'Letter mark' logo combination with 'pictorial mark'. The letter mark is obviously about 2 character 'G' & "a'.

The pictorial mark also a 3D logo, its build from the strongest form (triangle) and not only 1, but 4 triangle to become a pyramid. This pictorial mark is about solid and strong building like or home or roof.
This pictorial is expected to be trusted by people looking for a roof elsewhere or across the ocean.