How do I protect photographs and documents from heat?

Almost every household keeps its irreplaceable photographs in one of the two worst places available: the loft, which bakes in summer and freezes in winter, or the garage, which is damp. The materials degrade slowly enough that nobody notices until an album is opened after fifteen years and the prints have gone yellow, stuck together or curled.

Step by step

1. Understand what actually causes the damage.Three things acting together. Heat accelerates the chemical reactions that fade dyes and yellow paper. Humidity causes cockling, mould and prints sticking to each other and to album sleeves. Light, particularly ultraviolet, fades images directly. Cycling between hot and cold, wet and dry, is more damaging than any steady condition, because materials expand and contract repeatedly.
2. Move them out of the loft, the garage and the cellar.A loft has the largest temperature swing in the house and can be extremely hot in summer. A garage and a cellar are damp and prone to summer condensation on cold surfaces. All three are the wrong answer. This single move is most of the job.
3. Store them somewhere stable instead.An interior cupboard on a middle floor, away from external walls, radiators, hot water cylinders and windows, is the best storage most homes contain. Stable matters more than cold — a consistently warm interior cupboard beats a loft that swings twenty degrees in a day.
4. Keep them off the floor and away from external walls.Floors flood and get damp; external walls are where condensation forms. A shelf, in the middle of a room, is a meaningfully better place than a box on the floor against an outside wall.
5. Use the right enclosures.Archival boxes and sleeves described as acid-free and lignin-free, and passing the Photographic Activity Test if you can find them, will not react with the prints. The ones to remove are old self-adhesive magnetic albums, which yellow and bond permanently to photographs, and PVC sleeves, which off-gas and damage images. Polyester, polypropylene and polyethylene sleeves are safe.
6. Store prints flat and boxes not too tightly.Flat storage supports the whole print and prevents curling. Do not pack a box so tightly that prints cannot be removed without bending, and do not leave it so loose that they slump. Rubber bands, paper clips, sticky notes and treasury tags all cause permanent damage and should come off.
7. Separate the ones that are already stuck or damaged.Photographs stuck to glass or to each other, or showing mould, need care rather than force — pulling them apart destroys the image layer. Isolate them, keep them dry, and consult a conservator for anything genuinely irreplaceable. Do not attempt to soak them apart on a valued original.
8. Digitise the irreplaceable ones now.This is the only true protection, because it removes the single point of failure entirely. Scan or photograph the images that matter most, keep the files in at least two places with one off-site or in cloud storage, and check periodically that they still open. Physical storage slows decay; a backup survives a fire.
9. Frame with care if you display them.Never hang an original photograph in direct sunlight — display a copy and store the original. Use ultraviolet-filtering glazing, a mount that keeps the print off the glass, and hang away from radiators, fireplaces and bathrooms.
10. Give the same treatment to documents.Birth and marriage certificates, deeds, wills and passports degrade the same way, and additionally matter legally. Store them flat, unfolded where possible, in an acid-free folder, somewhere stable — and keep scanned copies, since replacing an original is slow and expensive.

Tips

• A phone camera in good light produces a perfectly usable copy of a print. Do not let the absence of a scanner stop you digitising the ones that matter.
• Digitise the oldest material first. Recent photographs generally exist digitally already; the 1970s prints in the loft do not exist anywhere else.
• Write on the back of a print with a soft pencil rather than a pen — ballpoint indents the image and ink can bleed through.
• Old negatives and slides are often in better condition than the prints made from them and can produce a much better scan. Do not throw them away.
• A cheap hygrometer in the storage cupboard tells you whether the space is genuinely as dry as you assume, which is worth knowing before filling it with irreplaceable material.

Common mistakes

• Storing photographs in the loft — It has the largest temperature and humidity swing of anywhere in the house. That cycling degrades prints and paper faster than steady warmth would.
• Keeping photographs in self-adhesive magnetic albums — The adhesive yellows and bonds permanently to the print, and the covering sheet off-gasses. Removing photographs from them years later frequently destroys the image.
• Using PVC sleeves or pockets — PVC off-gasses plasticisers that damage photographic emulsion. Polyester, polypropylene and polyethylene are the safe plastics.
• Assuming physical storage is enough — Careful storage slows decay but does not protect against fire, flood or theft. Only a digital copy stored elsewhere does that.

Checklist

• Nothing irreplaceable stored in the loft, garage or cellar
• Interior cupboard, middle floor, away from external walls and heat sources
• Boxes off the floor and on a shelf
• Magnetic albums and PVC sleeves replaced with archival ones
• Rubber bands, clips and sticky notes removed
• Prints stored flat, boxes neither packed tight nor slumping
• The important images scanned and backed up in two places

Questions people ask