Ir Cons Sci J 2017; 1(1): [23][24][25][26][27][28][29][30][31] Silane/siloxane surface treatment are proposed as potential polymeric materials for protective and consolidation coatings of limestone substrates. The silane and silioxane coatings are widely used to strengthen and waterproof of historical monuments. Historical stones are very fragile because of bearing many years in sever weathering conditions. Strengthening historical stones requires paying attention to surface treatment by the aim of decreasing humidity and improvement of mechanical properties. Toward this end, the consolidation coatings using silane and siloxane resins can improve the mechanical properties of historical stones against weathering condition. In this study, two types of coatings based on mixed of silane/siloxane as potential coatings to consolidate historical stones were proposed and the mechanical results were compared with uncoated stones. The mechanical tests approved the silane and siloxane resins can be considered as a proper choice to protect and strengthen historical stones. The results indicated that the contact angle of the coated samples rises up with treating by silane/siloxane resins. This could be due to the presence of organic groups of poly siloxanes act as hydrophobic agents which increase the hydrophobic nature of the surface contact angle. In addition, Si-OH bond of silane as well as consolidation effect can be created the covalent bonding by mineral surface and filling of the small fissures in the stone surfaces.