<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1430325183282_59393"> Hi Trnsys users,</div><div id="yui_3_16_0_1_1430325183282_59392"><br></div><div id="yui_3_16_0_1_1430325183282_59377" dir="ltr">I am trying to create a model of a lightweight contruction sport hall, which consists of two leyers of special Polyester foils, and a 70cm air layer between. In reality, the construction is streched and held in place by a wood sceleton.</div><div id="yui_3_16_0_1_1430325183282_59466"><br></div><div id="yui_3_16_0_1_1430325183282_59467" dir="ltr">I have noticed, that whichever air layer is chosen from the library, it is modelled as massless, and the tickness is 0. </div><div id="yui_3_16_0_1_1430325183282_59469"><br></div><div id="yui_3_16_0_1_1430325183282_59484">How can I change the tickness of the Air layer?</div><div id="yui_3_16_0_1_1430325183282_59451" dir="ltr"><br></div><div id="yui_3_16_0_1_1430325183282_59434" dir="ltr">In addition, I get the following error messages when I try to save the project "error when trying to create wall transfer coefficients"</div><div id="yui_3_16_0_1_1430325183282_59450">" unable to find root, after indication that root exists"</div><div id="yui_3_16_0_1_1430325183282_59449">"Maybe time base is to small"</div><div id="yui_3_16_0_1_1430325183282_59469"><br></div><div id="yui_3_16_0_1_1430325183282_59485">What could be the couse of the error I am getting?</div><div id="yui_3_16_0_1_1430325183282_59486"><br></div><div id="yui_3_16_0_1_1430325183282_59494"><br></div><div id="yui_3_16_0_1_1430325183282_59495">Thank you for helping!</div></div></body></html>