334. Standard of repair.

If he has expressly covenanted to put a house into tenantable repair and to keep it in such repair, and it is not in tenantable repair at the commencement of the tenancy, the tenant must do the necessary repairs, notwithstanding that the building is thereby put in a better condition than when the landlord let it1. The effect is the same if, without expressly covenanting to put it into repair, the tenant covenants only to keep the house in tenantable repair. Such a covenant presupposes putting the housing in such repair, and keeping it in repair during the term2.