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Horizontal waterproofing , like below grade waterproofing , is a crucial component of maintaining a watertight seal. In most horizontal waterproofing applications, Douglass Colony of Colorado will apply the membrane over finished space such as patios, terraces, planters or garden roofs. In the majority of applications, a hot-applied reinforced membrane is required from top manufacturers such as American Hydrotech or CETCO. Douglass Colony Group has installed numeroushorizontal waterproofing applications including INVESCO Field at Mile High, The Denver Botanic Gardens, The Hyatt Downtown (Denver) and the Residences at 29th Street (Boulder).