Store your LPs vertically. This places far less stress on the vinyl and ensures that the records will not become bent. In addition, the grooves on the vinyl records may become stressed if they are heavily stacked, one on top of the other. This can result in degraded sound quality over time.
Make sure that your vertically stacked records do not "lean." This can cause warping, which will cause serious problems on the turntable, and could make the LPs virtually unplayable.
Make sure that your LPs are not vertically stacked too tightly. Again, this can cause damage to the grooves and decreased sound quality.
Store the records in a cool, nonhumid environment. Heat can cause the vinyl to soften and bend. Humidity can cause microscopic mold to form in the grooves of the records, which can be difficult to remove.
Keep your vinyl records in the inner plastic sleeve inside the dust jacket. Never use paper or cardboard sleeves, as they can scratch the record.
Do not store LPs in a dusty environment and make sure that any air-conditioning units in the area have a dust filter.