1 Lay the concrete base
Prepare a suitable concrete base for the garage. The floor should be 100mm (4in) thick but the edges built up to 200mm (8in) thick to support the walls, and built on a sub-base of a minimum of 100mm (4in) well-compacted and levelled hardcore. Take the time to thoroughly check for any possible problems at this stage, as any slight problems at this stage will be magnified once construciton of the garage starts.
2 Support the lower sections
While the lower sections of the garage wall are being assembled, they will need to be supported outside by 'buttresses'. These can be made using lengths of stout timber, angled (but not pushing) against the walls. These will hold the structure securely while other components are being added.
3 Erect second level
The second level of wall panels are erected and fixed to the first. Make sure you have safe and level access as you will be working at a height, and work from the inside of the structure. Once the roof cross members are in place, the structure will become more stable.
4 Raise roof sections
On a large-span roof, you will need the assistance of at least one (or ideally two) helper(s) to help you raise and slide the roof into position across the members. Position ladders inside the garage and work slowly and carefully. Do not overstretch when on a ladder, stop what you are doing, climb down and reposition the ladder if you feel you are overstretching.
5 The last roof section
The final roof section will need to be lifted and positioned from outside and from above. Never stand on the roof of any structure or you could fall through. Instead, use crawl boards to evenly distribute your weight.
6 Hang the door
Lastly, hang the door or doors. If you have selected double-hinged doors that open outwards, then these are hung as you would hang an external door. See the next page for advice on installing an up-and-over door.
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