(a) The association must use the damage estimation module to estimate damage to components of a structure that is the subject of a residential slab claim. The association must use the following inputs:
  (1) outputs from the wind field and surge and wave models described in §5.4035 and §5.4037, respectively, of this title; and
  (2) property database information.
(b) The association must determine the total damage to a structure attributable to wind by:
  (1) estimating the time history of wind damage to components and systems according to the damage estimation module, without considering the effects of storm surge and waves;
  (2) estimating the probability of collapse due to surge and waves (Psurge ) using Variant 5 of the methodology in Tomiczek, T., Kennedy, A., and Rogers, S., Collapse Limit State Fragilities of Wood-Framed Residences From Storm Surge and Waves During Hurricane Ike, Journal of Waterway, Port, Coastal, and Ocean Engineering (ASCE), (2014) 140(1), 43-55, dx.doi: 10.1061/(ASCE)WW.1943-5460.0000212;
  (3) estimating the probability that wind caused the collapse of the structure (Pwind ) by determining the maximum of the probabilities of failure for wall studs in bending, the connections of the wall studs to the wall plates, and the shear walls using the damage estimation module;
  (4) calculating the time of surge slabbing (tsurge ), which is the earlier of the time at which:
    (A) the probability of surge and wave collapse (P surge ) reaches its maximum; or
    (B) the probability of surge and wave collapse first reaches 50 percent;
  (5) calculating the wind damage to each building component at the time of surge slabbing (Dt_surge ) using the damage estimation module; and
  (6) calculating wind damage each building component sustained during the applicable storm (Dtotal_component ) using the formula:
Attached Graphic
(c) The association must also use an observational approach, as described in Section 6 of the expert panel's report, along with the probabilistic approach described in §§5.4032 - 5.4040. In using an observational approach, the association must consider the following:
  (1) modeled or observed surge and wave heights;
  (2) peak wind speed;
  (3) post-event photographs referenced in §5.4036(b) of this title; and
  (4) observed damage to surviving structures.
(d) The association may input representations of the wind exposure category for eight direction sectors.
(e) The association may also incorporate other methods for computing probabilities of component and system failure due to wind such as the Monte Carlo simulation or the Rackwitz-Fiessler method.

Source Note: The provisions of this §5.4038 adopted to be effective March 28, 2017, 42 TexReg 1459