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Thomas G. Johnson <br />Richard L. Peterson <br />William J. Walburg <br />T. Clayton Beebe <br />Lester J. Johnson <br />City of Roseville <br />2660 Civic Center Drive <br />Roseville, Minnesota 5511-3 <br />R�t:4fq(;4 <br />James Andre <br />City -Manager <br />JACU'S ASSOCIATES, INC. <br />CONSULTING ENGINEERI <br />300 BUILDURS EXCHANGE BUILDIN <br />MINNEAPOLIS, MINNESOTA 55402. <br />PHONE 1612) 336­33JZ <br />Decerrber 6, 1972 <br />.i <br />J <br />Re: Under-Floor Heating System <br />.V.oseville-Ice Arena <br />We are writing this letter in response to your questio <br />concerning the use of additional insulation and sand i1h <br />lieu of under-floor heating system. <br />V <br />The refrigerated brine pipes take heat away from the <br />V <br />ground'un-derneath -Ice rink and increasing the amount <br />of insulation will not stop this heat removal. Increase,;_9_ <br />amounts of 'Insulation only slows down the rate of heat <br />rem.e�v&_76 . <br />There has been test3Lng done, such-as at the Burnsville <br />arena, that shows th-at installation of non-frost susceptib_Uw <br />soil down to 15 feet or more could eliminate the need for <br />under-floor heating. The ground freezes, but doesn't heave. <br />