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P a g e 2 o f 2 D. S o l ar P an el A n c h o r a g e 1. The solar panels shall be mounted in accordance with the m os t recent Unirac installation manual. If during solar panel installation, th e roof framing m em bers appear unstable or deflect non- uniformly, our office should be notified before proceeding with the installation. 2. The maxi mum allowable withdrawal force for a 5/16? lag screw is 235 Ibs per inch of penetration as identified in the National Design Standards (N D S ) of timber construction specifications. Based on a m i n im um penetration depth of 2%?, th e allowable capacity per connection is greater than the design withdrawal force (demand). Considering the variable factors for the existing roof framing and installation tolerances, the connection using on e */16? diameter lag screw with a minimum of 2%" em bedm en t will be adequate an d will include a sufficient factor of safety. 3. Considering the wind speed, roof slopes, size an d spacing of framing members, and condition of the roof, th e panel supports shall be placed no greater than 72? on centers. 4. Panel supports connecti ons shall be staggered to distribute load to adjacent frami n g members. B a s e d o n t h e a b o v e ev al uation , th i s off i ce certi fi es t h a t w i t h t h e rac k i n g a n d m o u n t i n g sp eci f ied, t h e exi sti n g r oo f s y s t e m will a d e q u a t e l y s u p p o r t t h e addition al l o a d i n g i m p o s e d by t h e s ol ar s y s t e m . T h i s ev a l u at i on is in c o n f o r m a n c e w i t h t h e 2 0 1 9 C al i f or n i a B ui l di n g C o d e , c ur r e n t i n d u s t r y s t an dar ds , a n d is b a s e d o n i n f o r m at i o n s up p l i ed t o us a t t h e t i m e of th is rep or t. Should you have any questions regarding th e above or if you require further information do not hesitate to contact me. Ve truly yours, 7 2 4 0 2 : Scott E. Wysslig@,PE California License N 2529 N Alona St 02/16/23