110 of the present invention appear to have a u201c w u201d shape i e their cross sections and their pattern as viewed from the end of the strips resemble the letter u201c w u201d as shown in the left side of fig1 fig1 shows the u201c m u201d and u201c w u201d configurations side by side for comparative and illustrative purposes only it being understood that a single deck would not feature both configurations together this u201c w u201d pattern is shown in detail in the perspective view of fig2 b in the end view of fig4 and in the section view of fig6 hereinafter the strips 110 having a u201c w u201d orientation will be referred to as u201c over joist u201d trim strips details of the under joist trim strip 10 will be discussed in relation to fig2 a 3 and 5 the under joist trim strips 10 are applied to the bottom edges of the joists 80 as in the right side of the deck 100 of fig1 as shown the under joist trim strip 10 has several elongated panels connected together along their lengths referring to fig2 a the two center panels 18 and 20 are connected along a common edge forming a ridge 50 the v shaped channel formed between these panels extends the entire length of the strip 10 as shown partially in hidden lines in fig2 a the v shaped channel forms a drainage trough for draining water away from the building two parallel side panels 16 and 22 are connected to the center panels 18 and 20 respectively extending from side panel 22 is an outwardly projecting flange 24 which is normal to side panel 22 on the opposite side of trim.