The way in which home maintenance guidelines tackle firewalls is quite inconsistent. Although home inspection issues and firewall building code problems are not really cross-purpose, they are not completely aligned either. A firewall is an architecture intended to satisfy a double wish. Check This Out for more details.
The motive behind firewall-related home inspection codes of conduct is not to ensure whether the building code has been practiced so much as to assess if the dual purpose remains real. The first aspect of this intention is to prevent exhaust fumes, particularly carbon monoxide, which occur in the garage, from reaching a residence’s living areas. The second aspect is focused on the premise that house fires are more likely to erupt in the garage; should this arise, the goal is to contain the fire in the garage or at least postpone its spread to the proper house long enough to provide enough time for the inhabitants, particularly children, to escape.
The theoretical idea of a firewall, though, is something that fulfills all aspects of the need for security. Building codes regulate the materialization of the theoretical concept, and years of bringing the codes into effect decide how the supposed objectives are met.
Home maintenance regulations simply circumvent the construction codes and interact explicitly with the problem at hand. We stipulate the fire isolation between the building and the (attached) workshop must be checked by the home inspector. The agreed definition of “fire separation” is that only after a time interval of at least one or two hours can a fire started in one area spread out to the other. In fact, the time interval must be retained on all conceivable routes, including specifically through windows and doors and implicitly through ceilings and uppers.
Clearly, it is difficult to calculate period in fire penetration throughout the process of a home inspection. The home inspector must therefore go one degree further away from the abstract concept and use guides to convert the implementation of such construction practices and materials into an estimated delay in penetration. Worries over pedestrian doors between garage and house and questions over drywall thickness are what everything boils down to for inspectors.
Home inspectors test to have a sturdy core at the pedestrian door(s) and to be marked as gas. A fire-rated door normally has a mark on the side of the door where the hinges are placed which marks it as such. Inspection guidelines remove the need for fire level assessment where the marking is not in place. The strong core and fire rank, at any point, yield a satisfactorily anticipated delay in penetration.
On all walls and ceilings, the correct drywall thickness has been empirically defined to be 1⁄2 inch. Home inspections can’t always accurately check that, but the outlines of the drywall are often visible in unfinished spaces and attic hatches. Design regulations and safety requirements align here, such that once the development of a house has been through the correct processes, the contractor will feel fairly sure that the thickness of the building inspectors has been checked.
Commercial building codes and multi-family housing stipulate the additional provision that walls between units will extend up to the roof from the attic. This condition is not unique to single-family houses, even between garage and building. Garages typically have either no attic or an attic separate from the attic of the home, however the author has observed one continuous room in all regions.