I have a situation for a Elevation Certificate I am doing in which the crawlspace is below the BFE about 0.3' but the outside lowest adjacent ground is 0.7' above BFE. Discussion has gone back and forth as to whether the lower or the higher elevation is critical. It seems to me that the LAG keeps water from entering the structure and so that would be the criteria for being above BFE. Any comments?
Also, while the LAG C2(f) is above BFE, the lowest adjacent grade of the steps and supports for an attached deck is 0.1' BELOW the BFE at one corner. This puts the whole structure below the BFE, right? Seems kind of - well, I'd say silly, but ridiculous is probably a better word. As if the slight flooding of a deck support or steps without getting to the main foundation is going to cause damage to the entire structure.
Just report the numbers. Remember, the fact that it is close to the BFE means that is at risk. A few tenths this way a few that way, there's no telling how a flood is going to act. It's better to be covered. I know the client does not want to hear it.
Tyler Parsons, post: 377631, member: 139 wrote: I have a situation for a Elevation Certificate I am doing in which the crawlspace is below the BFE about 0.3' but the outside lowest adjacent ground is 0.7' above BFE. Discussion has gone back and forth as to whether the lower or the higher elevation is critical. It seems to me that the LAG keeps water from entering the structure and so that would be the criteria for being above BFE. Any comments?
Also, while the LAG C2(f) is above BFE, the lowest adjacent grade of the steps and supports for an attached deck is 0.1' BELOW the BFE at one corner. This puts the whole structure below the BFE, right? Seems kind of - well, I'd say silly, but ridiculous is probably a better word. As if the slight flooding of a deck support or steps without getting to the main foundation is going to cause damage to the entire structure.
What does your local floodplain administrator say?
Ever see what happens when saturated ground finds a void, like a lower crawlspace?
Tyler Parsons, post: 377631, member: 139 wrote: Also, while the LAG C2(f) is above BFE, the lowest adjacent grade of the steps and supports for an attached deck is 0.1' BELOW the BFE at one corner. This puts the whole structure below the BFE, right? Seems kind of - well, I'd say silly, but ridiculous is probably a better word
What's more ridiculous is that if it weren't for the deck, the structure would qualify for a LOMA and get removed from the flood zone.
